ci: harden release provenance and Darwin x64 verification

.github/workflows/ci.yml

@@ -38,3 +38,23 @@ jobs:
 
       - name: Verify npm package contents
         run: bun run pack:dry-run
+
+  verify-darwin-x64:
+    runs-on: macos-15-intel
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: "1.3.9"
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Build compiled binary
+        run: bun run build
+
+      - name: Verify compiled binary
+        run: bun run build:verify

.github/workflows/release.yml

@@ -8,7 +8,6 @@ on:
 
 permissions:
   contents: write
-  id-token: write
   issues: write
   pull-requests: write
 
@@ -327,6 +326,9 @@ jobs:
     # npm provenance rejects self-hosted runners, including Blacksmith.
     # Keep this trust-sensitive publish step on a GitHub-hosted runner.
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
     needs: [semantic-release, publish-assets]
     if: needs.semantic-release.outputs.released == 'true'
     steps: