Initial import from garrytan/gstack@026751e (main snapshot via local relay)

Source: https://github.com/garrytan/gstack/commit/026751e

.github/workflows/skill-docs.yml

@@ -0,0 +1,33 @@
+name: Skill Docs Freshness
+on: [push, pull_request]
+jobs:
+  check-freshness:
+    runs-on: ubicloud-standard-8
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v2
+      - run: bun install
+      - name: Check Claude host freshness
+        run: bun run gen:skill-docs
+      - name: Verify Claude skill docs are fresh
+        run: |
+          git diff --exit-code || {
+            echo "Generated SKILL.md files are stale. Run: bun run gen:skill-docs"
+            exit 1
+          }
+      - name: Check Codex host freshness
+        run: bun run gen:skill-docs --host codex
+      - name: Verify Codex skill docs are fresh
+        run: |
+          git diff --exit-code -- .agents/ || {
+            echo "Generated Codex SKILL.md files are stale. Run: bun run gen:skill-docs --host codex"
+            exit 1
+          }
+      - name: Generate Factory skill docs
+        run: bun run gen:skill-docs --host factory
+      - name: Verify Factory skill docs are fresh
+        run: |
+          git diff --exit-code -- .factory/ || {
+            echo "Generated Factory SKILL.md files are stale. Run: bun run gen:skill-docs --host factory"
+            exit 1
+          }