Unfuck My Git State

1. Snapshot first. Do not "just try stuff."
2. Prefer non-destructive fixes before force operations.
3. Treat `.git/` as production data until backup is taken.
4. Use `git symbolic-ref` before manually editing `.git/HEAD`.
5. After each fix, run verification before proceeding.

## Fast Workflow

1. Capture diagnostics:
```bash
bash scripts/snapshot_git_state.sh .
```
2. Route by symptom using `references/symptom-map.md`.
3. Generate non-destructive command plan:
```bash
bash scripts/guided_repair_plan.sh --repo .
```
4. Apply the smallest matching playbook.
5. Run `references/recovery-checklist.md` verification gate.
6. Escalate only if the gate fails.

For explicit routing:
```bash
bash scripts/guided_repair_plan.sh --list
bash scripts/guided_repair_plan.sh --symptom phantom-branch-lock
```

## Regression Harness

Use disposable simulation tests before changing script logic:

```bash
bash scripts/regression_harness.sh
```

Run one scenario:

```bash
bash scripts/regression_harness.sh --scenario orphaned-worktree
```

## Playbook A: Orphaned Worktree Metadata

Symptoms:
- `git worktree list` shows a path that no longer exists.
- Worktree entries include invalid or zero hashes.

Steps:
```bash
git worktree list --porcelain
git worktree prune -v
git worktree list --porcelain
```
If stale entries remain, back up `.git/` and remove the specific stale folder under `.git/worktrees/<name>`, then rerun prune.

## Playbook B: Phantom Branch Lock

Symptoms:
- `git branch -d` or `git branch -D` fails with "already used by worktree".
- `git worktree list` seems to disagree with branch ownership.

Steps:
```bash
git worktree list --porcelain
```
Find the worktree using that branch, switch that worktree to another branch or detach HEAD there, then retry the branch operation in the main repo.

## Playbook C: Detached or Contradictory HEAD

Symptoms:
- `git status` says detached HEAD unexpectedly.
- `git branch --show-current` and `git symbolic-ref -q HEAD` disagree.

Steps:
```bash
git symbolic-ref -q HEAD || true
git reflog --date=iso -n 20
git switch <known-good-branch>
```
If branch context is unknown, create a rescue branch from current commit:
```bash
git switch -c rescue/$(date +%Y%m%d-%H%M%S)
```
Then reconnect to the intended branch after investigation.

## Playbook D: Missing or Broken Refs

Symptoms:
- `unknown revision`, `not a valid object name`, or `cannot lock ref`.

Steps:
```bash
git fetch --all --prune
git show-ref --verify refs/remotes/origin/<branch>
git branch -f <branch> origin/<branch>
git switch <branch>
```
Use `reflog` to recover local-only commits before forcing branch pointers.

## Last Resort: Manual HEAD Repair

Only after backup of `.git/`.

Preferred:
```bash
git show-ref --verify refs/heads/<branch>
git symbolic-ref HEAD refs/heads/<branch>
```
Fallback when `symbolic-ref` cannot be used:
```bash
echo "ref: refs/heads/<branch>" > .git/HEAD
```
Immediately run the verification gate.

## Verification Gate (Must Pass)

Run checks in `references/recovery-checklist.md`. Minimum bar:
- `git status` exits cleanly with no fatal errors.
- `git symbolic-ref -q HEAD` matches intended branch.
- `git worktree list --porcelain` has no missing paths and no zero hashes.
- `git fsck --no-reflogs --full` has no new critical errors.

## Escalation Path

1. Archive `.git`:
```bash
tar -czf git-metadata-backup-$(date +%Y%m%d-%H%M%S).tar.gz .git
```
2. Clone fresh from remote.
3. Recover unpushed work with reflog and cherry-pick from old clone.
4. Document failure mode and add guardrails to automation.

## Automation Hooks

When building worktree tooling (iMi, scripts, bots), enforce:
- preflight snapshot and state validation
- post-operation verification gate
- hard stop on HEAD/ref inconsistency
- explicit user confirmation before destructive commands

## Resources

- Symptom router: `references/symptom-map.md`
- Verification checklist: `references/recovery-checklist.md`
- Diagnostic snapshot script: `scripts/snapshot_git_state.sh`
- Guided plan generator: `scripts/guided_repair_plan.sh`
- Disposable regression harness: `scripts/regression_harness.sh`