`prepare-commit-msg` hook silently fails to add `Entire-Checkpoint` trailer

[AndrewGrossman]

What happened?

prepare-commit-msg hook silently fails to add Entire-Checkpoint trailer

Environment

• Entire CLI: v0.5.0 (0fa5295)
• OS: macOS (Darwin 25.3.0, arm64)
• Go version: go1.26.0
• Strategy: manual-commit
• Agents: Claude Code, Cursor

Problem

The prepare-commit-msg hook no longer adds Entire-Checkpoint trailers to commits, despite an active session being present. The hook runs successfully (exit 0) but does not modify the commit message. No error output is produced, even when 2>/dev/null is removed from the hook.

This was previously working and stopped. It might have broken when addressing hanging git activity caused due to assumptions that entire had made about existing hooks that were symlinks.

What I've tried

1. Removed 2>/dev/null from the prepare-commit-msg hook to check for hidden errors — no errors are produced, the hook just silently does nothing.
2. Tested the hook directly: entire hooks git prepare-commit-msg /tmp/test-msg message — exits 0 but does not modify the file contents.
3. Ran entire doctor — found 3 stuck sessions, fixed them. Did not resolve the issue.
4. Ran entire disable → entire reset --force → entire enable --agent claude-code — did not resolve the issue.
5. Verified session is active: entire status shows an active session with phase: "active", correct worktree_path, and checkpoint_count > 0.
6. This is not a v0.5.0 regression specifically — was also broken on v0.4.9. Upgraded to v0.5.0 hoping it would fix it.

Evidence

• Last commit with a trailer: d87de67240 — but this was made by a different team member on the same repo, confirming the feature works in general, just not on my machine.
• All my local commits across multiple branches since ~March 10 have no Entire-Checkpoint trailer, despite being made during active Entire sessions.
• Session state file (.git/entire-sessions/<id>.json) looks correct: phase: "active", valid base_commit, files_touched populated, checkpoint_count: 1.

Expected behavior

When committing during an active Entire session, the prepare-commit-msg hook should append an Entire-Checkpoint trailer to the commit message.

Actual behavior

The hook exits 0 and the commit message is not modified. No error output on stderr.

Reproduction

# Start a Claude Code session (Entire shows it as active in `entire status`)
# Make a change and commit:
echo "# test" >> README.md
git add README.md
git commit -m "test entire trailer"
git log -1 --format="%B"
# Output: "test entire trailer" — no Entire-Checkpoint trailer

Steps to reproduce

No response

Entire CLI version

Entire CLI 0.5.0 (0fa5295)

OS and architecture

Darwin 25.3.0 arm64

Agent

Claude Code

Terminal

No response

Logs / debug output

Additional context

No response

[peyton-alt]

Thanks for reporting this! Could you add:

1. Your entire version output
2. The exact steps to reproduce
3. Any relevant log output from ~/.entire/logs/

That'll help us track it down.