feat(check): dependency-aware staleness

[HMAKT99]

Closes #124.

What

akf check staleness was per-file: stamp auth.py green, change a helper it imports, and the stamp stayed OK while the thing it verified was no longer true.

Now:

• stamp_file records content hashes of the file's first-degree local imports (new python/akf/deps.py: AST-based, resolves same-dir and package-relative modules; stdlib/site-packages ignored) into unit.meta["deps"]
• akf check verifies those hashes and flips STALE reason=dependency_changed when any dependency moved — even though the stamped file's own bytes are unchanged

$ akf stamp main.py --evidence "tests pass"   # records helper.py's hash
$ echo 'def help(): return 999' > helper.py    # main.py untouched
$ akf check main.py
STALE ... reason=dependency_changed

Deliberately conservative per the issue discussion: first-degree only (full closure is expensive), local files only. Deleted/unreadable deps count as changed.

Testing

• 7 new tests: local-import resolution (stdlib/third-party ignored), package imports, dep-edit → STALE, deleted dep → STALE, untouched deps stay OK, meta recording
• Full suite: 1950 passed, 2 skipped

Credit: Dipankar Sarkar, who spotted the gap on the launch post.

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Project	Deployment	Actions	Updated (UTC)
akf	Ready	Preview, Comment	Jul 3, 2026 2:42pm
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AKF Trust Certification — ✅ Certified

❌ 0/11 files certified · average trust 0.45 · 3 failed

	File	Trust	Evidence	Issues
❌	skills/check.md	0.26	other	ai_content_without_review, trust_below_threshold, hallucination_risk, knowledge_laundering, ungrounded_ai_claims, excessive_ai_concentration, provenance_gap, unknown, unknown, unknown, unknown, unknown, unknown, unknown
❌	skills/hermes-akf/SKILL.md	0.54	human_review	ai_content_without_review, hallucination_risk, knowledge_laundering, ungrounded_ai_claims, excessive_ai_concentration, provenance_gap, unknown, unknown, unknown, unknown, unknown, unknown
❌	skills/openclaw-akf/SKILL.md	0.54	human_review	ai_content_without_review, hallucination_risk, knowledge_laundering, ungrounded_ai_claims, excessive_ai_concentration, provenance_gap, unknown, unknown, unknown, unknown, unknown, unknown

Total: 11 | Certified: 0 | Failed: 3 | Skipped: 8

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