release: prepare beta17 hosted provenance

.github/workflows/release.yml

@@ -364,7 +364,8 @@ jobs:
     name: Assemble and attest release assets
     if: ${{ always() && needs.build-release.result == 'success' && needs.build-windows.result == 'success' && needs.build-darwin.result == 'success' }}
     needs: [build-release, build-windows, build-darwin]
-    runs-on: blacksmith-4vcpu-ubuntu-2404
+    # The updater rejects self-hosted attestations; keep final release signing on GitHub-hosted infrastructure.
+    runs-on: ubuntu-24.04
     permissions:
       attestations: write
       contents: read
@@ -374,6 +375,12 @@ jobs:
       GH_REPO: ${{ github.repository }}
       VERSION: ${{ inputs.version }}
     steps:
+      - name: Require GitHub-hosted attestation runner
+        shell: bash
+        run: |
+          set -euo pipefail
+          test "${RUNNER_ENVIRONMENT:-}" = "github-hosted"
+
       - name: Checkout repository
         uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10
         with:

CHANGELOG.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## 0.1.44-beta.17 - 2026-09-23
+
+### Fixed
+
+- Generate release provenance from GitHub-hosted assembly runners so in-app updates pass the self-hosted runner policy without weakening attestation verification.
+
+### Tests
+
+- Verify release checksums and provenance before the updater consumes release metadata.
+
 ## 0.1.44-beta.16 - 2026-09-23
 
 ### Added