docs(agents): describe the CI link check and scan under Delivery

[altaywtf]

Change

AGENTS.md keeps local proof under Verification and moves the Next CI link check and scan to Delivery, fixing a docs-only row that contradicted it.

Claim	Before	After
Docs-only pull request	runs only the Markdown job	checks relative links, skips every lane
Link check, scan, verify dispatch	split across Verification and Delivery	one Delivery paragraph

• Select affected lanes runs on every event and checks links offline, so the proof row now asks only for web links and commands.
• Docs only: merging runs Next CI on next; nothing signs, versions, or publishes.

Validation

• oxfmt@0.70.0 --check '**/*.md', the command pnpm run markdown:check runs
• Claims checked against .github/workflows/ci-next.yml on next
  Unverified: the offline link check runs in this pull request's CI only

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Written by an agent (Claude Code, Claude Opus 5.5)

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