feat(skills): add llm-structured-output (#280)

* chore: sync generated registry files [ci skip]

* feat(skills): scaffold llm-structured-output with valid frontmatter and section structure

* feat(skills): define scope and trigger conditions for llm-structured-output

* feat(skills): add primary workflow instructions to llm-structured-output

* feat(skills): add runnable examples and output templates to llm-structured-output

* feat(skills): add anti-patterns, edge cases and production best practices to llm-structured-output

* chore: register llm-structured-output in registry and pass validation

* chore: sync generated files for llm-structured-output

* chore: sync generated README for llm-structured-output

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: sck_0 <samujackson1337@gmail.com>

data/catalog.json

@@ -1,6 +1,6 @@
 {
   "generatedAt": "2026-02-08T00:00:00.000Z",
-  "total": 1251,
+  "total": 1252,
   "skills": [
     {
       "id": "00-andruia-consultant",
@@ -18067,6 +18067,32 @@
       ],
       "path": "skills/llm-prompt-optimizer/SKILL.md"
     },
+    {
+      "id": "llm-structured-output",
+      "name": "llm-structured-output",
+      "description": "Get reliable JSON, enums, and typed objects from LLMs using response_format, tool_use, and schema-constrained decoding across OpenAI, Anthropic, and Google APIs.",
+      "category": "data-ai",
+      "tags": [
+        "llm",
+        "structured",
+        "output"
+      ],
+      "triggers": [
+        "llm",
+        "structured",
+        "output",
+        "get",
+        "reliable",
+        "json",
+        "enums",
+        "typed",
+        "objects",
+        "llms",
+        "response",
+        "format"
+      ],
+      "path": "skills/llm-structured-output/SKILL.md"
+    },
     {
       "id": "local-legal-seo-audit",
       "name": "local-legal-seo-audit",