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-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