[wasikarn]

What

• New audit check 79 (skills/meta/harness-audit/scripts/checks/79-doc-facts-match-tree.sh). It compares prose facts to values taken from the tree:
  • The manifest's "Nine computational deny/ask gates (...) plus a SubagentStop verdict-check gate" (plugin.json and marketplace.json): N + 1 must equal the gate ids in hooks/hook-registry.json, with -handback twins dropped.
  • The README gate table rows must match that same id set. The WARN names the missing or extra id.
  • README Skills (N) must equal the SKILL.md count minus MANIFEST_EXPECTED_EXCLUDED. README Agents (N) and agent-authoring-conventions.md's "N-agent fleet" must equal the agents/*.md count.
  • The harness-audit SKILL.md "What it checks" ids must match audit.sh _exp_ids. Only an id at the start of a segment counts, so 25 words and 1536 chars are not read as ids.
  • plugin.json .version must equal the marketplace.json entry's version.
• Severity is WARN. An absent source file gives an INFO skip. A file that is present but has lost its pinned phrase WARNs, so rewording the prose cannot silently drop the pin.
• The README gate table now has a row for gate:tool:routine-trigger-guard, so it lists all 10 gates.
• Check 79 is registered in _exp_ids and in SKILL.md's check table (Doc rot row). The test header now lists 79. The fleet-good manifest gained a description that carries the pinned phrase.

Why

The README listed 9 of the 10 gates and has never named routine-trigger-guard since that gate landed (1.1.151). This is the second time a stated count has drifted (CHANGELOG records an earlier "6 gates" drift), so per the repeated-mistake rule it gets a check.

Proof

• Test first: I added 9 fixtures (check-79-*) and their asserts before the check existed. The self-test went red with 18 FAIL, because --only 79 matched no fragment.
• After the check was added: self-test: 144 passed, 0 failed.
• Live run before the README fix: WARN: README.md gate table lacks gate:tool:routine-trigger-guard (in hooks/hook-registry.json). After the fix: 0 WARN.
• Mutation pass: 9 mutants, each kills at least one check-79 assert (drop the +1, keep the handback twins, ignore the exclusion list, read any number as an id, remove the vanished-phrase guard, flip the version compare, skip missing set members, drop the agent-doc pin, silence the INFO skip).
• audit.sh: 0 CRIT, 0 WARN. GAUNTLET_JOBS=2 scripts/run-gauntlet.sh: all layers passed.

No manifest bump.

Closes #388