feat: add command registry and coverage checks (#1906)

Salvages the useful parts of #1897 without generated .caliber state or stale counts.

- adds a deterministic command registry generator and drift check
- commits the current command registry for 75 commands
- validates the rc.1 README catalog summary against live counts
- adds a single Ubuntu Node 20 coverage job instead of running coverage in every matrix cell

Co-authored-by: jodunk <jodunk@users.noreply.github.com>

.github/workflows/ci.yml

@@ -220,6 +220,10 @@ jobs:
         run: node scripts/ci/catalog.js --text
         continue-on-error: false
 
+      - name: Validate command registry
+        run: npm run command-registry:check
+        continue-on-error: false
+
       - name: Check unicode safety
         run: node scripts/ci/check-unicode-safety.js
         continue-on-error: false
@@ -253,6 +257,33 @@ jobs:
       - name: Run supply-chain IOC scan
         run: npm run security:ioc-scan
 
+  coverage:
+    name: Coverage
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Setup Node.js
+        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
+        with:
+          node-version: '20.x'
+
+      - name: Install dependencies
+        run: npm ci --ignore-scripts
+
+      - name: Run coverage
+        run: npm run coverage
+
+      - name: Upload coverage report
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: coverage-ubuntu-node20-npm
+          path: coverage/
+
   lint:
     name: Lint
     runs-on: ubuntu-latest