fix(tests): point the strict-mode dependency citation at README.md

Why: this branch moved the prerequisites list out of AGENTS.md into README.md
but left three references behind. The worst is run-tests.sh's --strict failure
message, which a developer is handed at the exact moment a push gate fails and
they need the dependency list: it named AGENTS.md, which no longer documents
vale, apm or jq anywhere. 56cc173 re-anchored this same class of citation in
.pre-commit-config.yaml, scripts/check-vale-style-sync.sh,
scripts/sync-marketplace-mirror.sh and tests/test-check-vale-style-sync.sh --
tests/run-tests.sh was missed, and it is the only one a human actually reads.

Implementation notes:
- run-tests.sh:262 (user-visible), run-tests.sh:16 (header rationale) and
  test-run-tests.sh:395 all now cite README.md's Prerequisites table, verified
  to name vale, apm, jq, python3/PyYAML and the claude CLI.
- Every assertion on this message greps for "a skip is a SETUP ERROR", which
  sits before the changed clause, so no test needed updating.
- test-vale-wrap.sh's bash 3.2 citation is corrected in the same pass: it
  credited LESSONS.md and the script headers, but LESSONS.md's only mention of
  3.2 is an aside inside an unrelated lesson, not a target declaration. It now
  cites scripts/lib/batch-run.sh and providers/claude-code/statusline-command.sh,
  which do declare it. The citation 56cc173 replaced was already false, so this
  finishes a half-fix rather than correcting a regression.

Impact: forced the strict-failure path with vale removed from PATH and confirmed
the corrected message printing -- 21 passed, 3 skipped, exit 1. Full suite with
vale present: 24 passed, 0 skipped, 0 failed.

Refs: #105

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TmFqzpuExLJv3m114XVE9w

tests/test-run-tests.sh

@@ -392,10 +392,11 @@ fi
 
 # --- 10. --strict turns a skip into a failure, and names the suite AND the reason ---
 # Graceful skipping is right for an ad-hoc run and wrong for a gate. At pre-push a
-# suite exiting 77 means a dependency AGENTS.md documents as required is missing
-# on the pushing machine -- and pre-commit prints nothing at all for a passing
-# hook, so the skip list this script writes to stdout was swallowed whole. A
-# vale-less PATH shipped a green gate having verified 15 of 17 suites.
+# suite exiting 77 means a dependency README.md's Prerequisites table documents
+# as required is missing on the pushing machine -- and pre-commit prints nothing
+# at all for a passing hook, so the skip list this script writes to stdout was
+# swallowed whole. A vale-less PATH shipped a green gate having verified 15 of
+# 17 suites.
 #
 # The reason is asserted, not just the name: "something was skipped" leaves the
 # reader with no idea which binary to install, which is most of why the swallowed