release: prepare Desktop 0.13.7 and Agent 0.13.1

Prepare the approved bilingual Desktop 0.13.7 and Agent 0.13.1 release
notes, version locks, feature matrices, and Agent release notes. Package both
OpenCode and Continue in the compound Agent release and publish native
execution checklists for remote projects.

Fix Linux source validation by configuring Electron's chrome-sandbox helper
and running the full test suite under Xvfb without disabling sandboxing.

Release note: Desktop 0.13.7 adds paged canvas notes, HTTP OCR, managed app
navigation, remote Continue and execution checklists, while preserving
conversation history and improving remote/runtime recovery. Agent 0.13.1
ships OpenCode and Continue together with checklist delivery.

Validation: npm test passed; npm run typecheck passed; npm run lint passed;
npm run release:notes:verify passed; 22 release workflow tests passed. No
local production build or package was run. LoongArch preview is not included.

.github/workflows/packages.yml

@@ -40,9 +40,16 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Prepare sandboxed Electron tests
+        run: |
+          sudo apt-get update
+          sudo apt-get install --no-install-recommends --yes xvfb xauth
+          sudo chown root:root node_modules/electron/dist/chrome-sandbox
+          sudo chmod 4755 node_modules/electron/dist/chrome-sandbox
+
       - name: Run validators
         run: |
-          npm test
+          xvfb-run --auto-servernum npm test
           npm run typecheck
           npm run lint