Issue
Commits never receive Entire-Checkpoint trailers despite hooks running correctly. The prepare-commit-msg hook finds sessions but logs "no content to link" for all of them.

The root cause is a path format mismatch in
stagedFilesOverlapWithContent
.
getStagedFiles()
returns repo-relative paths (e.g., src/screens/SessionDetail.tsx) from git diff --cached --name-only, but state.FilesTouched stores the exact paths the agent provides — often absolute (e.g., /Users/alex/project/src/screens/SessionDetail.tsx). The touchedSet[stagedPath] lookup silently fails, so no file ever reaches the content comparison logic.

A contributing factor is that opencode export returns invalid JSON, which prevents the active session's live transcript fallback from detecting content.

Solution
Normalize at write time:
mergeFilesTouched
now accepts a worktreePath parameter and normalizes all incoming paths to repo-relative form via a new
normalizeToRepoRelative
helper before storing them in state.FilesTouched.
Basename fallback at read time:
stagedFilesOverlapWithContent
now builds a secondary touchedByBase map keyed by filepath.Base(). When the exact path lookup fails, it falls back to basename matching to handle stale sessions from older CLI versions.
Debug logging: A new log line ("path format mismatch, matched by basename") makes this class of silent failure visible in future.