chore(deps): consolidate GitHub Actions dependency updates

Switch from SHA-pinning to tag refs for all workflow actions.
Consolidates 2 Dependabot PRs:
- #37: actions/checkout 6.0.3 → v7 (major)
- #36: softprops/action-gh-release 3.0.0 → v3

Also un-pins actions/setup-node (v6) for consistency.

Supersedes: #36 #37

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -17,10 +17,10 @@ jobs:
       matrix:
         node-version: ["22.x", "24.x"]
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@v7
 
       - name: Set up Node ${{ matrix.node-version }}
-        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
           cache: npm
@@ -49,10 +49,10 @@ jobs:
     name: e2e · opencode loads plugin & lists models
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@v7
 
       - name: Set up Node
-        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
+        uses: actions/setup-node@v6
         with:
           node-version: "24.x"
           cache: npm

.github/workflows/release.yml

@@ -22,10 +22,10 @@ jobs:
       contents: write # create the GitHub Release
       id-token: write # npm provenance attestation
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@v7
 
       - name: Set up Node
-        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
+        uses: actions/setup-node@v6
         with:
           node-version: "22.x"
           registry-url: "https://registry.npmjs.org"
@@ -98,7 +98,7 @@ jobs:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
 
       - name: Create GitHub Release
-        uses: softprops/action-gh-release@b4309332981a82ec1c5618f44dd2e27cc8bfbfda # v3.0.0
+        uses: softprops/action-gh-release@v3
         with:
           name: "v${{ steps.version.outputs.VERSION }}"
           generate_release_notes: true