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

patterns/archetypes/link-checker.json

@@ -0,0 +1,34 @@
+{
+  "id": "link-checker",
+  "label": "Broken Link Checker",
+  "description": "Find and fix broken links in documentation on a recurring schedule",
+  "success_rate": null,
+  "count": 0,
+  "recommended_triggers": [
+    {
+      "type": "schedule",
+      "config": {}
+    }
+  ],
+  "recommended_safe_outputs": [
+    "pull-requests"
+  ],
+  "recommended_tools": [
+    "create-pull-request"
+  ],
+  "timeout_minutes": 60,
+  "prompt_style": "phase-based",
+  "size_range_bytes": [
+    3000,
+    8000
+  ],
+  "top_repos": [],
+  "tips": [
+    "Pre-fetch and test every link in a steps: block before the agent starts — link testing is deterministic and does not need agent judgment",
+    "Persist a list of previously-confirmed unfixable links in cache-memory so scheduled runs don't repeatedly retry links with no available replacement",
+    "Use protected-files: fallback-to-issue so link fixes in protected paths open an issue instead of silently failing",
+    "Set if-no-changes: warn on create-pull-request and pair with noop so a run with no broken links exits cleanly instead of failing",
+    "Only replace a broken link when a working equivalent or redirect target is confirmed — do not guess at replacement URLs"
+  ],
+  "anti_patterns": []
+}

patterns/manifest.json

@@ -30,7 +30,8 @@
     "ci-failure-triage",
     "community-digest",
     "agent-cost-tracker",
-    "contribution-guidelines-checker"
+    "contribution-guidelines-checker",
+    "link-checker"
   ],
   "workflow_generation": "workflow-generation.json",
   "anti_patterns": [

patterns/workflow-generation.json

@@ -1054,6 +1054,35 @@
         "- **DO NOT** post more than one comment per run.",
         "- **DO NOT** apply the ready label and post a needs-work comment in the same run — pick one outcome."
       ]
+    },
+    "link-checker": {
+      "icon": "link",
+      "capabilities": {
+        "bash": true
+      },
+      "permissions": [
+        "contents"
+      ],
+      "body": [
+        "# {{label}}",
+        "",
+        "You are an automated **link checker and fixer** for this repository's documentation.",
+        "",
+        "{{pre_steps}}",
+        "## Process",
+        "",
+        "1. Read the link check results collected in the pre-step",
+        "2. Load cache memory for previously confirmed unfixable links and skip them",
+        "3. For each broken link, research whether the content moved to a new URL, redirect, or official replacement",
+        "4. Fix links you can confirm a working replacement for; record unconfirmed ones in cache memory as unfixable",
+        "5. Open a pull request with the fixes, or call `noop` if nothing needed fixing",
+        "",
+        "## Constraints",
+        "",
+        "- **DO NOT** guess at replacement URLs without confirming they resolve.",
+        "- **DO NOT** modify relative links or anchors — only HTTP(S) links.",
+        "- **DO NOT** retry links already recorded as unfixable in cache memory without new evidence."
+      ]
     }
   }
 }