Initial setup: PostgreSQL best practices repository

Skeleton structure for Supabase PostgreSQL experts to add performance
optimization rules. Modeled after Vercel's react-best-practices-build.

Includes:
- Build system (parser, validator, builder)
- Skill manifest and metadata
- Rule templates and writing guidelines
- CI workflow for validation
- Getting started guide for Postgres team

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: PostgreSQL Best Practices CI
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'skills/postgresql-best-practices/**'
+      - 'packages/postgresql-best-practices-build/**'
+  pull_request:
+    paths:
+      - 'skills/postgresql-best-practices/**'
+      - 'packages/postgresql-best-practices-build/**'
+
+jobs:
+  validate-and-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install dependencies
+        working-directory: packages/postgresql-best-practices-build
+        run: npm install
+
+      - name: Validate rule files
+        working-directory: packages/postgresql-best-practices-build
+        run: npm run validate
+
+      - name: Build AGENTS.md
+        working-directory: packages/postgresql-best-practices-build
+        run: npm run build
+
+      - name: Check for uncommitted changes
+        run: |
+          if [[ -n $(git status --porcelain skills/postgresql-best-practices/AGENTS.md) ]]; then
+            echo "Error: AGENTS.md is not up to date"
+            echo "Run 'npm run build' and commit the changes"
+            git diff skills/postgresql-best-practices/AGENTS.md
+            exit 1
+          fi