* enhance(#2573): stamp STATE.md with its commit and surface a commit-age freshness hint Adds a `state_head` stamp to STATE.md and derives a tri-state commit-age freshness proxy (state_commits_behind / state_commit_stale) through state.cjs's readStateHeadFreshness, surfaced on smart-entry signals and as health W024. The proxy is advisory: classify() deliberately does NOT consume it (ADR-1787 locks the classification/routing boundary — a signal, not a route). Composes with #3099 and #1882 (both merged to next after this branch): the commit-age proxy reads `state_head` while the LAST_ACTIVITY_UNPARSEABLE diagnostic reads `last_activity` — two different fields, not "two staleness signals on one field." A new regression test asserts a STATE.md carrying both an unparseable last_activity AND a valid state_head resolves each independently (diagnostic fires once; freshness reads state_head, commits_behind 0). Rebased onto next (flattened): resolved the add/add conflicts in src/smart-entry.cts (kept both the #2573 freshness import/derivation and the #3099 diagnostic import/call) and tests/smart-entry.unit.test.cjs (kept both describe blocks). Drift-ack for health.md's W024 row is unchanged (12348 B). Tests: smart-entry 62, state/state-transition/health/verify 639, all pass. * chore(#2573): allowlist health-validation test in the prompt-injection scan The scanner's `exec('` code-execution pattern matches the benign `re.exec('<phase-id>')` RegExp method calls in the phase-ID grammar tests (pre-existing: 16 such calls on next, this PR adds none). The file entered the diff-mode scan's changed-file set only because #2573's W024 state_head assertions touch it. Allowlist it alongside the other test files that carry pattern-matching content as data (same DEFECT.PROMPT-INJECTION-SCAN-COLLISION class). Scanner self-test 38/0; diff scan 14 files, 0 findings.
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