Pattern miner: Add curated link-checker archetype from upstream pattern mining

[github-actions]

Upstream sources mined

• githubnext-agentics/files/workflows/link-checker.md — daily scheduled workflow that pre-tests all documentation links deterministically in a steps: block, then uses cache-memory to track links previously confirmed unfixable, and opens a PR via create-pull-request with protected-files: fallback-to-issue and if-no-changes: warn, falling back to noop when nothing needs fixing.
• githubnext-agentics/files/workflows/update-docs.md (line 99: "Check for broken links, missing images, or formatting issues") and github-gh-aw/files/.github/aw/triggers.md (line 19/41: "Govern documentation content (stale pages, broken links, outdated ownership)" / "Documentation governance: schedule (weekly) or pull_request... check stale ownership, broken links, and missing metadata") — corroborating upstream documentation recommending scheduled link/content governance as a recognized pattern distinct from general doc updates.

Recurring pattern found

A dedicated "check and fix broken links" shape recurs distinctly from the existing documentation-updater archetype: it is deterministic-first (pre-fetch/test links in steps: rather than agent judgment), uses cache-memory as a persistent skip-list for links with no available fix, and is scoped narrowly to link validity rather than general content accuracy. One direct upstream workflow (link-checker.md) demonstrates the full shape, corroborated by upstream triggers.md documentation explicitly calling out "broken links" governance as a canonical schedule-triggered pattern with its own create-issue/add-comment output guidance, satisfying the "one workflow + explicit doc recommendation" bar.

Why the existing library did not cover it

The existing documentation-updater archetype only generically mentions "Fix inaccuracies, broken links, and outdated examples" in its runtime body text, but its curated tips do not capture the two evidence-backed techniques that distinguish this shape: (1) pre-fetching/testing links deterministically before the agent starts, and (2) persisting a cache-memory list of confirmed-unfixable links to avoid repeated wasted retries on a recurring schedule. No archetype in patterns/archetypes/ or entry in patterns/manifest.json covers this narrower, deterministic-first link-checking shape.

What changed in patterns/

• Added patterns/archetypes/link-checker.json — new curated archetype (success_rate: null, count: 0, top_repos: []) with schedule trigger, pull-requests safe output, and tips reflecting the deterministic pre-check + cache-memory skip-list pattern.
• Appended "link-checker" to archetypes in patterns/manifest.json.
• Added a link-checker entry to patterns/workflow-generation.json with icon, capabilities, permissions, and a prompt body reflecting the mined process (read pre-fetched results, consult cache memory, fix confirmed replacements, open PR or noop).

Validation

• npm test — 18 test files, 319 tests passed.
• npm run build — production build succeeded (site + patterns copied into dist/).

Candidates deliberately left out

• Discussion task miner (discussion-task-miner.md) — only one upstream workflow demonstrates this shape (scan discussions → create issues); no corroborating upstream documentation recommends it as a distinct pattern, so it does not meet the two-workflow or doc-backed bar.
• Sub-issue closer / hierarchy auto-close (sub-issue-closer.md) — largely already covered by the existing issue-hierarchy-manager archetype's update-issue/close-parent tips.
• Editorial-board / unbloat-docs "PR cap gate" pre-activation step (tech-content-editorial-board.md, unbloat-docs.md) — a useful refinement, but scoped to code-improvement/documentation-updater tips that already mention the "skip scheduled runs once too many open PRs" guidance, so it is already represented.
• Campaign/multi-agent-research design docs (campaign.md, multi-agent-research.md) — these are meta-guidance documents, not recurring workflow shapes from actual upstream workflows, so they don't meet the archetype bar.

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