docs: move PR ready and landing guidance into ship-landing skill

[jazz127]

Purpose

Move the PR reporting-boundary evidence instructions into upstream's ship-landing skill through housefeature/evidence-boundary-coverage.

Change

• Replace the old AGENTS.md PR ready/landing block with the upstream ship-landing pointer.
• Put this feature's published-body read-back, evidence-validation=failed, and publication-scope rules into the skill.
• Register the skill in the documentation audience inventory. The review fix updates two documentation links that pointed to the old AGENTS.md location.

This durable branch is house-based and is not a clean upstream contribution candidate. Review also noted preexisting URL parsing behavior and a helper naming concern in runtime code; this instruction relocation does not change that code.

Validation

Synthetic/offline built-CLI validation: no-mistakes review, test, document, and lint stages completed. The pipeline's local probes are not external account confirmation. CI was skipped because this feature base has no matching check workflow.

Merge order

The upstream skill-layout PR #67 has merged. Merge this PR into housefeature/evidence-boundary-coverage first. Then open the house-based integration merge PR, preserving current house rules where the older durable branch conflicts. Use merge commits.

evidence-artifact: /tmp/fm-firstmate-upstream-5872-merge-r1/pr73-evidence.txt
evidence-command: no-mistakes axi status
evidence-captured: 2026-09-27T10:34:04Z

Pipeline attestation