context-check

An optional, on-demand drift audit for bypass cases: a merge or an external edit drifted a tracked source file you are not about to commit, so commit-gate's Phase 5.5 auto-heal did not fire. This skill reports stale docs and lets you act on each one individually.

This skill is NOT in the daily loop. Commit-gate auto-heal (Phase 5.5, heal_worklist) owns the routine maintenance path. Invoke this only when drift was introduced outside a commit (e.g. a direct push, a merge you did not author, a manual file edit).

Pre-flight

Read these before computing drift:

1. .codearbiter/.provenance/ — the per-doc provenance records. Load all records via load_provenance_dir from {{PLUGIN_ROOT}}/hooks/_provenancelib.py.
2. .codearbiter/code-map.md — coarse concern map; read to orient on which modules the stale docs govern.

Flow

Step 1 — Compute drift

Use _provenancelib helpers in this order:

1. load_provenance_dir(root + "/.codearbiter/.provenance/") — returns the provenance map {doc: record}.
2. Collect all drift_trigger: true paths across all records.
3. batch_hash(paths, runner) — hash every existing path in one git call.
4. compute_drift(provenance_map, current_hashes) — returns a drift report {doc: [{path, kind}]} for docs that have stale sources.

Alternatively reuse the same logic as startup_drift_line by calling it for a human-readable summary, then inspecting compute_drift directly for detail.

If the drift report is empty: report "no stale docs — provenance is fresh" and exit. No further action required.

Step 2 — Report stale docs

For each doc in the drift report, call changed_scope(doc_provenance, drift) to list its drifted paths. Present a concise report before offering actions:

Stale docs (N):
  <doc>: <path1>, <path2>  (changed | missing)
  ...

Step 3 — Per-doc action loop

For each stale doc, present three choices and wait for the user to select one:

re-scout — dispatch an incremental re-scout of the drifted paths for this doc, scoped to those paths only (like commit-gate Phase 5.5 heal but manually invoked). The scout re-reads the changed paths and reports whether claims still hold. If claims still hold: silently re-baseline the hashes via rebaseline. If claims changed: surface the proposed doc edits for the user to accept before re-baselining.

re-baseline — acknowledge the drift without re-scouting: call rebaseline(provenance, current_hashes) to update the stored hashes silently. Use this when the source change is cosmetic (formatting, comments, whitespace) and the derived doc claims are still accurate.

defer — do nothing for this doc now. The drift line will reappear at the next SessionStart. Use when the change is in-progress and the doc update should wait for a later commit.

After processing all stale docs, summarize which docs were re-scouted, re-baselined, or deferred.

Hard rule

This skill MUST NOT commit. If re-scout or re-baseline produces updated .codearbiter/.provenance/ records, those file changes ride the next user-initiated commit through commit-gate normally. No staging, no commits here.