Merge main branch - keep both race condition and subscription tests

Resolved conflicts by preserving both test functions:
- test_concurrent_get_deduplication_race (issue #1886)
- test_isolated_node_local_subscription (PR #1844)

Both tests are essential for regression coverage.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: sanity

.github/workflows/claude.yml

@@ -26,7 +26,7 @@ jobs:
       actions: read # Required for Claude to read CI results on PRs
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 1