fix: address review — guard grooming in gardener-poll.sh, doc fixes

- Add --recipes-only flag to gardener-poll.sh to skip grooming call when
  invoked by the formula's ci-escalation-recipes step (prevents double-run)
- Update formula step to pass --recipes-only
- Add lib/file-action-issue.sh to AGENTS.md shared helpers table
- Clarify TOML arg scope in gardener trigger description
- Fix log prefixes in gardener-run.sh (poll: → run:)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

formulas/run-gardener.toml

@@ -191,7 +191,7 @@ needs = ["grooming"]
 id    = "ci-escalation-recipes"
 title = "CI escalation recipes (bash — gardener-poll.sh)"
 executor = "bash"
-script   = "gardener/gardener-poll.sh"
+script   = "gardener/gardener-poll.sh --recipes-only"
 description = """
 NOT a Claude step — executed by gardener-poll.sh before/after the Claude session.
 Documented here so the formula covers the full gardener run.