feat(trellis): enhance bundled skills and workflow integration

- Updated bundled skills documentation to clarify the structure and usage across all platforms, ensuring consistency in skill root paths.
- Introduced a new `inject-spec-context.py` hook for path-scoped spec context injection, improving the relevance of injected specs during file interactions.
- Enhanced existing hooks to support workflow resolution, allowing for dynamic selection of workflows based on task context.
- Added a command to manage workflow selections for active tasks, enabling better task management and workflow adherence.
- Updated configuration options for spec injection, including character limits and refresh windows, to optimize performance and usability.

.codex/hooks/inject-spec-context.py

@@ -0,0 +1,844 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Path-Scoped Spec Context Injection Hook (ticket-refresh model)
+
+When the agent touches a file, the specs that govern that file are surfaced
+right then — small, relevant, budgeted — instead of everything up front or
+nothing at all. Spec .md files under .trellis/spec/ declare which code paths
+they govern via YAML frontmatter (`paths:` glob list); the matching engine
+lives in .trellis/scripts/common/spec_match.py and the decision engine in
+.trellis/scripts/common/spec_inject.py. This file is the IO shell: stdin,
+config, identity, state files, locking, GC, one print.
+
+Triggers:
+
+* Claude Code PostToolUse (matcher "Read|Edit|Write|MultiEdit") receives one
+  structured file path after the tool runs.
+* Codex PreToolUse (matcher "Edit|Write") receives an ``apply_patch`` command.
+  Every patch header is matched before the patch runs. When a FULL spec is
+  emitted, the patch is denied once so the model can read the injected rules
+  and retry; ticket-only reminders do not block.
+* OpenCode ``tool.execute.before`` adapts ``write``, ``edit``, and
+  ``apply_patch`` into the same PreToolUse payload. FULL delivery uses the same
+  deny-once decision before the JS plugin surfaces context as a tool error.
+
+Behavior — per matched spec, per event (recency-decay aware):
+
+    h    = sha256(spec bytes)
+    last = newest emission recorded for (identity, spec)   # stateless → None
+    if stateless:               emit TICKET  # bounded cost, always
+    elif last is None:          emit FULL    # first time this session
+    elif last.sha256 != h:      emit FULL    # spec changed → re-teach
+    elif reset since last:      emit FULL    # the text is gone, re-teach
+    elif within window:         silent       # fixed window; no state append
+    else:                       emit TICKET  # refresh attention cheaply
+
+A FULL block inlines the (budgeted) spec body with a sha256 attr; a TICKET is
+a short reminder pointing back at the spec. Both append a state record; silent
+hits do not (fixed window, not sliding — continuous editing is exactly when
+drift is worst).
+
+Identity (misfire asymmetry: a collision that MISSES an injection is
+unacceptable; drift that OVER-injects is fine): the session/window key is
+delegated to common.active_task.resolve_context_key — the shared resolver
+every other hook uses — called payload-first, environment-inclusive second,
+so two live sessions can never collapse onto one exported env value. A
+`+a-<agent_id>` suffix (appended after each part is sanitized) keeps a
+subagent's state separate from its parent's. When the resolver is unavailable
+(older installed scripts tree), a minimal payload-only ladder (session keys,
+then transcript hash) keeps the hook working. No key from any source, or an
+unwritable state dir → stateless: no state IO at all, every hit is a TICKET
+(circuit breaker — never a FULL re-emission loop).
+
+State: user-global, out of the repo, one append-only JSONL file per identity
+under ${TRELLIS_SPEC_STATE_DIR:-~/.trellis/spec-inject}/<project16>/<identity>.jsonl.
+SessionStart(clear|compact) appends an opaque reset marker to the base session
+shard; parent and subagent emission histories stay separate but observe that
+shared marker. A best-effort fcntl lock is held across read→decide→append;
+where fcntl is unavailable (Windows) the worst case is a duplicate injection.
+A once-per-hour GC prunes conforming shards older than 48 h.
+
+Budget (config.yaml `spec_injection:`): per-spec cap `max_spec_chars`
+(default 9400) with code-point truncation + in-body notice; per-event cap
+`max_total_chars` (default 9500 — below Claude Code's documented
+additionalContext ceiling, and enforced directly for Codex). Once the total
+budget is exhausted, remaining FULL bodies degrade to one <spec-index> block;
+tickets are counted last and dropped (with a stderr warning) only if even they
+do not fit.
+
+Refresh window (config.yaml `spec_injection:`): `refresh_window_seconds`
+(default 2700; `0` = never refresh unchanged content solely because time
+passed).
+
+Fail-open on errors: non-matching events, malformed paths, no matches, or any
+internal error → exit 0 with no stdout (stderr warnings allowed). The only
+deliberate block is a Codex patch that just received a FULL governing spec.
+"""
+from __future__ import annotations
+
+# IMPORTANT: Suppress all warnings FIRST
+import warnings
+warnings.filterwarnings("ignore")
+
+import hashlib
+import json
+import os
+import re
+import sys
+import time
+import uuid
+from pathlib import Path
+
+# IMPORTANT: Force UTF-8 on Windows for the streams this hook uses.
+# stdin carries the payload (non-ASCII file paths), stdout carries the spec
+# bodies, stderr carries warnings that quote both; without this the default
+# ANSI codepage raises UnicodeDecodeError / UnicodeEncodeError.
+if sys.platform.startswith("win"):
+    import io as _io
+    for _stream_name in ("stdin", "stdout", "stderr"):
+        _stream = getattr(sys, _stream_name, None)
+        if _stream is None:
+            continue
+        if hasattr(_stream, "reconfigure"):
+            try:
+                _stream.reconfigure(encoding="utf-8", errors="replace")  # type: ignore[union-attr]
+            except Exception:
+                pass  # Optional Windows stream setup; keep hook startup non-fatal.
+        elif hasattr(_stream, "detach"):
+            try:
+                setattr(sys, _stream_name, _io.TextIOWrapper(_stream.detach(), encoding="utf-8", errors="replace"))
+            except Exception:
+                pass  # Optional Windows stream setup; keep hook startup non-fatal.
+
+
+# =============================================================================
+# Constants
+# =============================================================================
+
+DIR_WORKFLOW = ".trellis"
+DIR_SPEC = "spec"
+
+# Tools whose events trigger spec matching (Claude Code tool names). Touching a
+# file — even a Read — counts; the miss path stays a fast exit. Overridable via
+# config `spec_injection.tools` (e.g. to drop "Read").
+DEFAULT_EDIT_TOOLS = ("Read", "Edit", "Write", "MultiEdit")
+
+# Budget defaults sized against Claude Code's documented 10,000-CHARACTER
+# additionalContext ceiling — stay under with margin. The <spec-context>
+# wrapper (~152 chars with typical rel paths) counts against the total, so a
+# spec lands whole only up to ~9348 chars; at the per-spec cap the block is
+# derived-truncated further to fit the event ceiling. `0` = unlimited.
+DEFAULT_MAX_SPEC_CHARS = 9400
+DEFAULT_MAX_TOTAL_CHARS = 9500
+
+# Refresh-window default. `0` = never refresh solely because time passed.
+DEFAULT_REFRESH_WINDOW_SECONDS = 2700
+
+# State-file base dir (overridable for tests / hermeticity) and GC policy.
+STATE_ENV_DIR = "TRELLIS_SPEC_STATE_DIR"
+STATE_DEFAULT_DIR = "~/.trellis/spec-inject"
+GC_MARKER = ".last-gc"
+GC_INTERVAL_SECONDS = 60 * 60          # GC runs at most once per hour
+STATE_MAX_AGE_SECONDS = 48 * 60 * 60   # shards older than this are pruned
+
+# GC scope: exactly `<base>/<project16>/<identity>[.<pid>].jsonl`, never a
+# recursive walk — a hostile or mistyped TRELLIS_SPEC_STATE_DIR must not turn
+# this hook into an unlink loop over someone's files. The optional `.<pid>`
+# alternative covers shards written by the pre-lock layout.
+GC_PROJECT_DIR_RE = re.compile(r"^[0-9a-f]{16}$")
+# `+` is part of the identity charset: subagent shards use the `+a-<agent_id>`
+# suffix (contract amendment 2 — without it those shards were never pruned).
+GC_SHARD_NAME_RE = re.compile(r"^[A-Za-z0-9_+-]+(\.[0-9]+)?\.jsonl$")
+PATCH_PATH_RE = re.compile(
+    r"^\*\*\* (?:(?:Add|Update|Delete) File|Move to): (.+)$"
+)
+
+def _warn(message: str) -> None:
+    print(f"[inject-spec-context] WARN: {message}", file=sys.stderr)
+
+
+def _patch_paths(command: str) -> list[str]:
+    """Return file paths from the shared apply_patch grammar."""
+    paths: list[str] = []
+    for line in command.splitlines():
+        match = PATCH_PATH_RE.fullmatch(line)
+        if match:
+            path = match.group(1).strip()
+            if path and path not in paths:
+                paths.append(path)
+    return paths
+
+
+def _agent_id(payload: dict) -> str:
+    """The subagent id carried by the event, or "" for a main-session event."""
+    raw = payload.get("agent_id")
+    return raw.strip() if isinstance(raw, str) else ""
+
+
+def find_trellis_root(start: Path) -> Path | None:
+    """Walk up from start to find the directory containing .trellis/.
+
+    Handles CWD drift: subdirectory launches, monorepo packages, etc.
+    Returns None if no .trellis/ found (silent no-op).
+    """
+    cur = start.resolve()
+    while cur != cur.parent:
+        if (cur / DIR_WORKFLOW).is_dir():
+            return cur
+        cur = cur.parent
+    return None
+
+
+def _scripts_dir_on_path(root: Path) -> None:
+    scripts_dir = root / DIR_WORKFLOW / "scripts"
+    if str(scripts_dir) not in sys.path:
+        sys.path.insert(0, str(scripts_dir))
+
+
+# =============================================================================
+# Config (.trellis/config.yaml `spec_injection:` section)
+# =============================================================================
+
+
+def _read_trellis_config(root: Path) -> dict:
+    """Load .trellis/config.yaml via the bundled trellis_config helper.
+
+    The helper lives in .trellis/scripts/common; the hook lives outside the
+    scripts tree, so we extend sys.path before importing.
+    """
+    _scripts_dir_on_path(root)
+    try:
+        from common.trellis_config import read_trellis_config  # type: ignore[import-not-found]
+    except Exception:
+        return {}
+    try:
+        return read_trellis_config(root)
+    except Exception:
+        return {}
+
+
+def _parse_tools(raw: object) -> tuple[str, ...] | None:
+    """Parse `spec_injection.tools` into a tuple of tool names.
+
+    Two grammars, because the bundled YAML reader hands the value over in two
+    shapes: a block list (``- Edit`` items) arrives as a list, a flow sequence
+    (``tools: [Edit, Write]``) arrives as the raw string. ``[]`` in either
+    shape is a deliberate "never trigger" and is respected. Returns None for a
+    value that is neither (the caller warns and keeps the defaults).
+    """
+    if isinstance(raw, list):
+        return tuple(t.strip() for t in raw if isinstance(t, str) and t.strip())
+    if isinstance(raw, str):
+        text = raw.strip()
+        if text.startswith("[") and text.endswith("]"):
+            items = (part.strip().strip("\"'").strip() for part in text[1:-1].split(","))
+            return tuple(item for item in items if item)
+    return None
+
+
+def get_spec_injection_settings(
+    root: Path,
+) -> tuple[bool, int, int, int, tuple[str, ...]]:
+    """Return (enabled, max_spec_chars, max_total_chars,
+    refresh_window_seconds, tools).
+
+    Reads the ``spec_injection:`` section of ``.trellis/config.yaml``:
+
+        spec_injection:
+          enabled: true
+          max_spec_chars: 9400
+          max_total_chars: 9500
+          refresh_window_seconds: 2700
+          tools:
+            - Read
+            - Edit
+            - Write
+            - MultiEdit
+
+    Missing keys use their defaults; ``0`` disables the corresponding limit
+    (``max_spec_chars: 0`` = inline the whole body, ``max_total_chars: 0`` =
+    no per-event ceiling) or refresh (window keys). ``tools`` also accepts a
+    flow sequence (``tools: [Edit, Write]``), and ``tools: []`` disables every
+    trigger. Invalid values fall back to the default for that key with a
+    stderr warning; tool names outside the known set warn once.
+    """
+    enabled = True
+    tools = DEFAULT_EDIT_TOOLS
+    numbers = {
+        "max_spec_chars": DEFAULT_MAX_SPEC_CHARS,
+        "max_total_chars": DEFAULT_MAX_TOTAL_CHARS,
+        "refresh_window_seconds": DEFAULT_REFRESH_WINDOW_SECONDS,
+    }
+
+    config = _read_trellis_config(root)
+    section = config.get("spec_injection") if isinstance(config, dict) else None
+    if isinstance(section, dict):
+        raw_enabled = section.get("enabled", True)
+        if isinstance(raw_enabled, bool):
+            enabled = raw_enabled
+        else:
+            s = str(raw_enabled).strip().lower()
+            if s in ("false", "no", "0", "off"):
+                enabled = False
+            elif s not in ("true", "yes", "1", "on"):
+                _warn(
+                    f"invalid spec_injection.enabled value: {raw_enabled!r}; "
+                    f"using true (default)"
+                )
+
+        # int() coercion stays local to this hook by decision (audit round,
+        # 2026-07-25): widening the shared common/config.py helpers has more
+        # blast radius than this small duplication costs.
+        for key, default_value in list(numbers.items()):
+            if key not in section:
+                continue
+            raw = section[key]
+            try:
+                value = int(raw)
+            except (TypeError, ValueError):
+                value = -1
+            if value < 0:
+                _warn(
+                    f"invalid spec_injection.{key} value: {raw!r}; "
+                    f"using default {default_value}"
+                )
+                continue
+            numbers[key] = value
+
+        if "tools" in section:
+            parsed_tools = _parse_tools(section["tools"])
+            if parsed_tools is None:
+                _warn(
+                    f"invalid spec_injection.tools value: {section['tools']!r}; "
+                    f"using default {list(DEFAULT_EDIT_TOOLS)}"
+                )
+            else:
+                tools = parsed_tools
+                unknown = [t for t in tools if t not in DEFAULT_EDIT_TOOLS]
+                if unknown:
+                    _warn(
+                        f"unknown spec_injection.tools entries {unknown} — "
+                        f"they will never match; known tools: "
+                        f"{list(DEFAULT_EDIT_TOOLS)}"
+                    )
+
+    return (
+        enabled,
+        numbers["max_spec_chars"],
+        numbers["max_total_chars"],
+        numbers["refresh_window_seconds"],
+        tools,
+    )
+
+
+# =============================================================================
+# Identity ladder
+# =============================================================================
+
+
+def _sanitize(raw: str) -> str:
+    """Map a session/agent id to a filename-safe, collision-free token.
+
+    A readable head (the first 80 characters, every character outside
+    ``[A-Za-z0-9_-]`` replaced one-for-one by ``-``) plus, whenever anything
+    was replaced or the id was longer than 80 characters, ``-`` and 8 hex of
+    sha256(raw). The suffix is what makes the mapping injective: without it,
+    "a/b" and "a:b" — or two ids sharing an 80-character prefix — would fold
+    onto one state file, and a collision that MISSES an injection is the
+    unacceptable failure. Output stays inside the GC name class.
+    """
+    raw = raw.strip()
+    head = raw[:80]
+    safe = re.sub(r"[^A-Za-z0-9_-]", "-", head)
+    if safe != head or len(raw) > 80:
+        digest = hashlib.sha256(raw.encode("utf-8")).hexdigest()[:8]
+        return f"{safe}-{digest}"
+    return safe
+
+
+def _shared_context_key(root: Path, payload: dict) -> str | None:
+    """Session/window key from the shared resolver every other hook uses.
+
+    ``common.active_task.resolve_context_key`` is the single source of truth
+    for session identity: payload keys in all casings (``session_id`` /
+    ``sessionId`` / ``sessionID``, conversation and transcript variants),
+    nested payload shapes, the explicit ``TRELLIS_CONTEXT_ID`` override,
+    per-platform env fallbacks, and Cursor shell tickets — plus the platform
+    fixes accumulated behind them. Payload identity is preferred over
+    environment context so two live sessions can never collapse onto one
+    exported env value (collision → missed injection is the unacceptable
+    direction); the environment pass still runs when the payload carries
+    nothing.
+    """
+    try:
+        _scripts_dir_on_path(root)
+        from common.active_task import resolve_context_key  # type: ignore[import-not-found]
+
+        key = resolve_context_key(payload, allow_environment_context=False)
+        if key:
+            return key
+        return resolve_context_key(payload)
+    except Exception:
+        return None
+
+
+def resolve_base_identity(root: Path, payload: dict) -> tuple[str, bool]:
+    """Return the base session identity for reset and refresh state.
+
+    When the shared resolver is unavailable (older installed scripts tree), a
+    minimal payload-only ladder keeps the hook working. ``stateless=True``
+    means no state IO is possible.
+    """
+    identity_payload = payload
+    if payload.get("hook_event_name") == "SessionStart":
+        # In this event `source` means startup/clear/compact, not platform.
+        # The shared resolver also accepts a generic `source` platform hint,
+        # so remove the lifecycle field to keep the same session identity as
+        # later PostToolUse events.
+        identity_payload = dict(payload)
+        identity_payload.pop("source", None)
+    key = _shared_context_key(root, identity_payload)
+
+    if not key:
+        # Minimal payload-only fallback for scripts trees that predate
+        # resolve_context_key. Mirrors its payload lookup order.
+        for k in ("session_id", "sessionId", "sessionID"):
+            value = payload.get(k)
+            if isinstance(value, str) and value.strip():
+                key = "s-" + value.strip()
+                break
+        if not key:
+            transcript = payload.get("transcript_path")
+            if isinstance(transcript, str) and transcript.strip():
+                digest = hashlib.sha256(
+                    transcript.strip().encode("utf-8")
+                ).hexdigest()
+                key = "t-" + digest[:16]
+
+    if not key:
+        return "", True
+
+    return _sanitize(key), False
+
+
+# =============================================================================
+# State (one append-only JSONL file per identity, locked, user-global)
+# =============================================================================
+
+
+def _state_base_dir() -> Path:
+    override = os.environ.get(STATE_ENV_DIR)
+    if override and override.strip():
+        return Path(override.strip())
+    return Path(os.path.expanduser(STATE_DEFAULT_DIR))
+
+
+def _project_id(root: Path) -> str:
+    return hashlib.sha256(os.path.realpath(str(root)).encode("utf-8")).hexdigest()[:16]
+
+
+def _maybe_gc(base_dir: Path) -> None:
+    """Prune conforming shards older than 48 h, at most once per hour.
+
+    Scope is exact-depth (``<base>/<project16>/<shard>.jsonl``) and name-gated;
+    foreign files and directories are never touched. Containment is enforced
+    against symlinks on both levels — a symlinked project dir or shard is
+    skipped outright, and every unlink candidate must still be under the
+    resolved base after realpath — so a planted link cannot walk this GC out
+    of its own tree. Best-effort, errors ignored.
+    """
+    try:
+        base_real = os.path.realpath(str(base_dir))
+        marker = base_dir / GC_MARKER
+        now = time.time()
+        try:
+            age = now - marker.stat().st_mtime
+        except OSError:
+            age = None
+        if age is not None and age < GC_INTERVAL_SECONDS:
+            return
+        try:
+            base_dir.mkdir(parents=True, exist_ok=True)
+            marker.touch()
+        except OSError:
+            return
+        try:
+            project_dirs = list(base_dir.iterdir())
+        except OSError:
+            return
+        for project_dir in project_dirs:
+            if not GC_PROJECT_DIR_RE.match(project_dir.name):
+                continue
+            try:
+                if project_dir.is_symlink() or not project_dir.is_dir():
+                    continue
+                shards = list(project_dir.iterdir())
+            except OSError:
+                continue
+            for shard in shards:
+                if not GC_SHARD_NAME_RE.match(shard.name):
+                    continue
+                try:
+                    if shard.is_symlink() or not shard.is_file():
+                        continue
+                    shard_real = os.path.realpath(str(shard))
+                    if not shard_real.startswith(base_real + os.sep):
+                        continue
+                    if now - shard.stat().st_mtime > STATE_MAX_AGE_SECONDS:
+                        shard.unlink()
+                except OSError:
+                    continue
+    except Exception:
+        pass
+
+
+def open_shard(shard_path: Path) -> int | None:
+    """Open (creating) the identity's shard for read+append.
+
+    Doubles as the writability probe: a failure here trips the circuit breaker
+    and the event runs stateless (ticket-only), which is bounded, instead of
+    re-emitting full specs on every event forever.
+    """
+    try:
+        shard_path.parent.mkdir(parents=True, exist_ok=True)
+    except OSError:
+        _warn(f"state dir {shard_path.parent} unusable — running stateless")
+        return None
+    try:
+        return os.open(
+            str(shard_path),
+            os.O_RDWR | os.O_CREAT | os.O_APPEND,
+            0o644,
+        )
+    except OSError:
+        _warn(f"state shard {shard_path} unusable — running stateless")
+        return None
+
+
+def lock_shard(fd: int) -> None:
+    """Best-effort exclusive lock held across read→decide→append.
+
+    Closes the duplicate-injection race between concurrent hook processes on
+    POSIX. No fcntl (Windows) or an unsupported filesystem → no lock; the
+    worst case is a duplicate injection, never a lost one.
+    """
+    try:
+        import fcntl
+
+        fcntl.flock(fd, fcntl.LOCK_EX)
+    except Exception:
+        pass
+
+
+def unlock_shard(fd: int) -> None:
+    try:
+        import fcntl
+
+        fcntl.flock(fd, fcntl.LOCK_UN)
+    except Exception:
+        pass
+
+
+def load_state(
+    fd: int,
+    state_version: int,
+) -> tuple[dict[str, dict], str | None] | None:
+    """Read the shard through the already-open fd; newest record per spec wins
+    (``ts`` decides, and on an exact tie the later line in the file does —
+    appends are ordered, and two records one float apart must not resolve to
+    the older one). The latest reset marker is returned separately. Malformed
+    lines and foreign schema versions are skipped silently; read failures
+    return None so the caller uses stateless ticket mode."""
+    result: dict[str, dict] = {}
+    latest_reset: str | None = None
+    try:
+        os.lseek(fd, 0, os.SEEK_SET)
+        chunks: list[bytes] = []
+        while True:
+            chunk = os.read(fd, 1 << 20)
+            if not chunk:
+                break
+            chunks.append(chunk)
+    except OSError:
+        return None
+
+    text = b"".join(chunks).decode("utf-8", errors="replace")
+    for line in text.splitlines():
+        line = line.strip()
+        if not line:
+            continue
+        try:
+            record = json.loads(line)
+        except (json.JSONDecodeError, ValueError):
+            continue
+        if not isinstance(record, dict):
+            continue
+        if record.get("v") != state_version:
+            continue
+        spec = record.get("spec")
+        reset = record.get("reset")
+        if not isinstance(spec, str):
+            if isinstance(reset, str) and reset:
+                latest_reset = reset
+            continue
+        ts = record.get("ts")
+        if not isinstance(ts, (int, float)):
+            continue
+        previous = result.get(spec)
+        if previous is None or ts >= previous.get("ts", float("-inf")):
+            result[spec] = record
+    return result, latest_reset
+
+
+def append_records(fd: int, records: list[dict]) -> bool:
+    """Append records as JSONL (O_APPEND) and report whether all bytes landed."""
+    if not records:
+        return True
+    try:
+        blob = "".join(json.dumps(r, ensure_ascii=False) + "\n" for r in records)
+        encoded = blob.encode("utf-8")
+        if os.write(fd, encoded) != len(encoded):
+            _warn("could not write complete state shard — state may be incomplete")
+            return False
+        return True
+    except OSError:
+        _warn("could not write state shard — state may be incomplete")
+        return False
+
+
+# =============================================================================
+# Entry
+# =============================================================================
+
+
+def main() -> int:
+    if os.environ.get("TRELLIS_HOOKS") == "0" or os.environ.get("TRELLIS_DISABLE_HOOKS") == "1":
+        return 0
+
+    try:
+        input_data = json.load(sys.stdin)
+    except (json.JSONDecodeError, ValueError, UnicodeDecodeError):
+        return 0
+    if not isinstance(input_data, dict):
+        return 0
+
+    cwd = input_data.get("cwd") or os.getcwd()
+    root = find_trellis_root(Path(cwd))
+    if root is None:
+        return 0
+    # Bail out before any spec scan when the project has no spec directory.
+    if not (root / DIR_WORKFLOW / DIR_SPEC).is_dir():
+        return 0
+
+    (
+        enabled,
+        max_spec_chars,
+        max_total_chars,
+        win_seconds,
+        tools,
+    ) = get_spec_injection_settings(root)
+    if not enabled:
+        return 0
+
+    _scripts_dir_on_path(root)
+    try:
+        from common.spec_inject import STATE_VERSION  # type: ignore[import-not-found]
+    except Exception:
+        return 0
+
+    if input_data.get("hook_event_name") == "SessionStart":
+        if input_data.get("source") not in ("clear", "compact"):
+            return 0
+        base_identity, stateless = resolve_base_identity(root, input_data)
+        if stateless:
+            _warn("SessionStart reset has no stable session identity")
+            return 0
+        base_dir = _state_base_dir()
+        _maybe_gc(base_dir)
+        reset_path = base_dir / _project_id(root) / f"{base_identity}.jsonl"
+        reset_fd = open_shard(reset_path)
+        if reset_fd is None:
+            return 0
+        try:
+            lock_shard(reset_fd)
+            append_records(
+                reset_fd,
+                [{"v": STATE_VERSION, "reset": uuid.uuid4().hex, "ts": time.time()}],
+            )
+        finally:
+            unlock_shard(reset_fd)
+            try:
+                os.close(reset_fd)
+            except OSError:
+                pass
+        return 0
+
+    event_name = input_data.get("hook_event_name")
+    tool_name = input_data.get("tool_name", "") or input_data.get("toolName", "")
+    if not isinstance(tool_name, str) or not tool_name:
+        return 0
+    is_pre_tool_use = event_name == "PreToolUse"
+    is_patch_tool = event_name == "PreToolUse" and tool_name == "apply_patch"
+    logical_tool = "Edit" if is_patch_tool else tool_name
+    # An empty `tools` list is the documented "disable every trigger" switch.
+    if not tools or logical_tool not in tools:
+        return 0
+
+    # snake_case is Claude Code's shape; camelCase keeps parity with the
+    # sibling hooks that already accept both (other platforms emit toolInput).
+    tool_input = input_data.get("tool_input")
+    if not isinstance(tool_input, dict):
+        tool_input = input_data.get("toolInput")
+    if not isinstance(tool_input, dict):
+        return 0
+    try:
+        from common.spec_match import (  # type: ignore[import-not-found]
+            match_specs_for_file,
+            normalize_repo_relative,
+        )
+        from common.spec_inject import (  # type: ignore[import-not-found]
+            assemble_payload,
+        )
+    except Exception:
+        return 0  # matching/decision engine unavailable — degrade to nothing
+
+    if is_patch_tool:
+        command = tool_input.get("command")
+        if not isinstance(command, str):
+            return 0
+        raw_paths = _patch_paths(command)
+    else:
+        file_path = tool_input.get("file_path")
+        if not isinstance(file_path, str) or not file_path.strip():
+            return 0
+        raw_paths = [file_path.strip()]
+
+    file_paths: list[str] = []
+    for raw_path in raw_paths:
+        normalized = normalize_repo_relative(root, raw_path)
+        if normalized is not None and normalized not in file_paths:
+            file_paths.append(normalized)
+    if not file_paths:
+        return 0
+
+    matches = []
+    match_files: dict[str, str] = {}
+    for file_path in file_paths:
+        for match in match_specs_for_file(root, file_path):
+            if match.rel_path in match_files:
+                continue
+            matches.append(match)
+            match_files[match.rel_path] = file_path
+    if not matches:
+        return 0
+
+    base_identity, stateless = resolve_base_identity(root, input_data)
+    identity = base_identity
+    agent = _agent_id(input_data)
+    if agent:
+        identity += "+a-" + _sanitize(agent)
+
+    state_records: dict[str, dict] = {}
+    clock = {"reset": None, "ts": time.time()}
+    fd: int | None = None
+
+    if not stateless:
+        base_dir = _state_base_dir()
+        _maybe_gc(base_dir)
+        project_dir = base_dir / _project_id(root)
+        base_fd = open_shard(project_dir / f"{base_identity}.jsonl")
+        if base_fd is None:
+            # Circuit breaker: unwritable state → ticket-only for this event.
+            stateless = True
+        else:
+            lock_shard(base_fd)
+            base_snapshot = load_state(base_fd, STATE_VERSION)
+            if base_snapshot is None:
+                stateless = True
+                unlock_shard(base_fd)
+                os.close(base_fd)
+            else:
+                base_records, reset_id = base_snapshot
+                if identity == base_identity:
+                    fd = base_fd
+                    state_records = base_records
+                else:
+                    unlock_shard(base_fd)
+                    os.close(base_fd)
+                    fd = open_shard(project_dir / f"{identity}.jsonl")
+                    if fd is None:
+                        stateless = True
+                    else:
+                        lock_shard(fd)
+                        snapshot = load_state(fd, STATE_VERSION)
+                        if snapshot is None:
+                            stateless = True
+                            unlock_shard(fd)
+                            os.close(fd)
+                            fd = None
+                        else:
+                            state_records, _ = snapshot
+
+                if not stateless:
+                    clock = {
+                        "reset": reset_id,
+                        "ts": time.time(),
+                    }
+
+    edited_rel = match_files[matches[0].rel_path]
+    records_persisted = True
+    try:
+        payload, records = assemble_payload(
+            edited_rel,
+            matches,
+            stateless,
+            state_records,
+            clock,
+            max_spec_chars,
+            max_total_chars,
+            win_seconds,
+            match_files=match_files,
+        )
+        if fd is not None and records:
+            records_persisted = append_records(fd, records)
+    finally:
+        if fd is not None:
+            unlock_shard(fd)
+            try:
+                os.close(fd)
+            except OSError:
+                pass
+
+    if not payload:
+        return 0
+
+    hook_specific_output = {
+        "hookEventName": "PreToolUse" if is_pre_tool_use else "PostToolUse",
+        "additionalContext": payload,
+    }
+    if (
+        is_pre_tool_use
+        and records_persisted
+        and any(record.get("mode") == "full" for record in records)
+    ):
+        hook_specific_output.update(
+            {
+                "permissionDecision": "deny",
+                "permissionDecisionReason": (
+                    "Trellis injected governing specs. Review them, then retry "
+                    "this tool call."
+                ),
+            }
+        )
+    output = {"hookSpecificOutput": hook_specific_output}
+    print(json.dumps(output, ensure_ascii=False))
+    return 0
+
+
+if __name__ == "__main__":
+    try:
+        sys.exit(main())
+    except Exception:
+        # Hook failures must never break the tool result or the session.
+        sys.exit(0)

.codex/hooks/inject-subagent-context.py

@@ -215,11 +215,12 @@ def truncate_utf8(data: bytes, cap: int) -> bytes:
             seq_len = 4
         else:
             seq_len = 1
-        # Drop the lead byte too if its full sequence didn't fit.
+        # Cut before the lead byte when its full sequence didn't fit;
+        # otherwise the trailing sequence is complete — keep it whole.
         if (i - 1) + seq_len > len(truncated):
-            i -= 1
+            return truncated[: i - 1]
 
-    return truncated[:i]
+    return truncated
 
 
 class _Budget:
@@ -877,8 +878,15 @@ def _handle_codex_subagent_start(input_data: dict) -> None:
     if not subagent_type or not parent_session_id:
         return
 
-    cwd = _string_value(input_data.get("cwd")) or os.getcwd()
-    repo_root = find_repo_root(cwd)
+    # Payload cwd first, then our own — some hosts (CodeBuddy IDE 4.10.4)
+    # report "/" for every hook event. See inject-workflow-state.py.
+    repo_root = None
+    for candidate in (_string_value(input_data.get("cwd")), os.getcwd()):
+        if not candidate:
+            continue
+        repo_root = find_repo_root(candidate)
+        if repo_root:
+            break
     if not repo_root:
         return
 

.codex/hooks/inject-workflow-state.py

@@ -10,19 +10,24 @@ The emitted ``hookEventName`` field is platform-aware: most hosts expect
 CodeBuddy / Droid / Codex / Copilot wiring), but Gemini CLI 0.40.x renamed
 its per-turn event to ``BeforeAgent`` and its schema validator rejects the
 legacy name. ``_detect_platform`` picks the right value at runtime.
-Breadcrumb text is pulled exclusively from workflow.md
-[workflow-state:STATUS] tag blocks — workflow.md is the single source of
-truth. There are no fallback dicts in this script: when workflow.md is
+Breadcrumb text is pulled exclusively from the resolved workflow file's
+[workflow-state:STATUS] tag blocks — the active task may select a
+per-task variant (`.trellis/workflows/<id>.md` via task.json `workflow`),
+otherwise personal, team, and global defaults are resolved in order.
+There are no fallback dicts in this script: when the resolved workflow is
 missing or a tag is absent, the breadcrumb degrades to a generic
 "Refer to workflow.md for current step." line so users see (and fix)
 the broken state instead of the hook silently masking it.
 
-Shared across all hook-capable platforms (Claude, Cursor, Codex, Qoder,
-CodeBuddy, Droid, Gemini, Copilot, Kiro). Kiro wires this via the CLI
+Which platforms register this hook is decided by SHARED_HOOKS_BY_PLATFORM
+in templates/shared-hooks/index.ts — currently Claude, Codex, Gemini,
+Qoder, Copilot, CodeBuddy, Droid, Kiro, Trae and ZCode. That table is the
+source of truth; each listed platform's collect<Platform>Templates() pulls
+this file into its template map through collectSharedHooks(), and a single
+writer puts that map on disk at init time. Kiro wires this via the CLI
 custom agent's ``hooks.userPromptSubmit`` and the IDE ``.kiro.hook``
 ``promptSubmit`` event; its output branch emits a plain-text breadcrumb
-(Kiro adds hook stdout directly to the conversation context). Written to
-each platform's hooks directory via writeSharedHooks() at init time.
+(Kiro adds hook stdout directly to the conversation context).
 
 Silent exit 0 cases (no output):
   - No .trellis/ directory found (not a Trellis project)
@@ -95,11 +100,16 @@ def find_trellis_root(start: Path) -> Optional[Path]:
 def _detect_platform(input_data: dict) -> str | None:
     if isinstance(input_data.get("cursor_version"), str):
         return "cursor"
+    # CLAUDE_PROJECT_DIR is a compatibility alias that several hosts set
+    # alongside their own variable — CodeBuddy, ZCode and Trae all do. It must
+    # therefore be checked LAST, or every one of them is detected as claude and
+    # the context key becomes `claude_<their-session-id>`. That key does not
+    # match the session file `task.py start` wrote under the host's real name,
+    # so every turn reports no_task while the pointer exists on disk.
+    # Observed on CodeBuddy IDE 4.10.4: session file `codebuddy_ae54840e….json`
+    # alongside marker `update-check-claude_ae54840e….marker`, same id.
     env_map = {
-        # ZCode may set both ZCODE_PROJECT_DIR and CLAUDE_PROJECT_DIR; check
-        # ZCODE first so ZCode sessions aren't misdetected as claude.
         "ZCODE_PROJECT_DIR": "zcode",
-        "CLAUDE_PROJECT_DIR": "claude",
         "CURSOR_PROJECT_DIR": "cursor",
         "CODEBUDDY_PROJECT_DIR": "codebuddy",
         "FACTORY_PROJECT_DIR": "droid",
@@ -108,6 +118,8 @@ def _detect_platform(input_data: dict) -> str | None:
         "KIRO_PROJECT_DIR": "kiro",
         "COPILOT_PROJECT_DIR": "copilot",
         "TRAE_PROJECT_DIR": "trae",
+        # Last: the shared alias, only meaningful once no vendor key matched.
+        "CLAUDE_PROJECT_DIR": "claude",
     }
     for env_name, platform in env_map.items():
         if os.environ.get(env_name):
@@ -183,16 +195,40 @@ _TAG_RE = re.compile(
     re.DOTALL,
 )
 
-def load_breadcrumbs(root: Path) -> dict[str, str]:
-    """Parse workflow.md for [workflow-state:STATUS] blocks.
+def _resolve_workflow_md(root: Path, input_data: dict) -> Path:
+    """Resolve the active task's workflow file, falling back to the global one.
 
-    Returns {status: body_text}. workflow.md is the single source of
+    The per-task resolution rule lives in common.workflow_selection inside
+    .trellis/scripts. Older installed projects may not ship that module, and
+    hooks must never crash the session — ANY failure (import error, old
+    scripts tree, resolver bug) falls back to the global workflow.md.
+    """
+    try:
+        scripts_dir = root / ".trellis" / "scripts"
+        if str(scripts_dir) not in sys.path:
+            sys.path.insert(0, str(scripts_dir))
+        from common.workflow_selection import resolve_workflow_md  # type: ignore[import-not-found]
+
+        return resolve_workflow_md(
+            root, input_data, platform=_detect_platform(input_data)
+        )
+    except Exception:
+        return root / ".trellis" / "workflow.md"
+
+
+def load_breadcrumbs(root: Path, input_data: dict) -> dict[str, str]:
+    """Parse the resolved workflow file for [workflow-state:STATUS] blocks.
+
+    Returns {status: body_text}. The workflow file is the single source of
     truth — there are no fallback dicts in this script. Missing tags
-    (or a missing/unreadable workflow.md) fall back to a generic line
+    (or a missing/unreadable workflow file) fall back to a generic line
     in build_breadcrumb so users see the broken state and fix
     workflow.md, rather than the hook silently masking the issue.
+    The active task's per-task workflow selection (task.json `workflow`
+    field) is honored via _resolve_workflow_md; without a selection this
+    reads the global .trellis/workflow.md exactly as before.
     """
-    workflow = root / ".trellis" / "workflow.md"
+    workflow = _resolve_workflow_md(root, input_data)
     if not workflow.is_file():
         return {}
     try:
@@ -411,7 +447,7 @@ def main() -> int:
     if prompt_has_skip_keyword(data.get("prompt", ""), _resolve_skip_keyword(config)):
         return 0  # user opted out of the per-turn breadcrumb for this turn
 
-    templates = load_breadcrumbs(root)
+    templates = load_breadcrumbs(root, data)
     platform = _detect_platform(data)
     task = get_active_task(root, data)
     if task is None:

.codex/hooks/session-start.py

@@ -452,6 +452,25 @@ def _strip_breadcrumb_tag_blocks(content: str) -> str:
     return re.sub(r"\n{3,}", "\n\n", stripped).strip()
 
 
+def _resolve_workflow_md(root: Path, input_data: dict) -> Path:
+    """Resolve the active task's workflow file, falling back to the global one.
+
+    The per-task resolution rule lives in common.workflow_selection inside
+    .trellis/scripts. Older installed projects may not ship that module, and
+    hooks must never crash the session — ANY failure (import error, old
+    scripts tree, resolver bug) falls back to the global workflow.md.
+    """
+    try:
+        scripts_dir = root / ".trellis" / "scripts"
+        if str(scripts_dir) not in sys.path:
+            sys.path.insert(0, str(scripts_dir))
+        from common.workflow_selection import resolve_workflow_md  # type: ignore[import-not-found]
+
+        return resolve_workflow_md(root, input_data, platform="codex")
+    except Exception:
+        return root / ".trellis" / "workflow.md"
+
+
 def _build_workflow_toc(workflow_path: Path) -> str:
     """Inject only the compact Phase Index summary for SessionStart."""
     content = read_file(workflow_path)
@@ -505,7 +524,7 @@ Trellis compact SessionStart context. Use it to orient the session; load details
     output.write("\n</current-state>\n\n")
 
     output.write("<trellis-workflow>\n")
-    output.write(_build_workflow_toc(trellis_dir / "workflow.md"))
+    output.write(_build_workflow_toc(_resolve_workflow_md(project_dir, hook_input)))
     output.write("\n</trellis-workflow>\n\n")
 
     output.write("<guidelines>\n")