#517 land: watcher-batch-root-wait

Accepted agent delivery; branch-keyed search descriptor included.

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Summary by cubic

Scopes the watcher batch refresh wait to its process root so oversized callgraph refreshes are verified more reliably in tests.

• Replaces the budgeted flush with wait_for_process_callgraph_refresh_for_test, waiting on the specific root.
• Adds a benchmark slice descriptor land-watcher-batch-root-wait.json for the search-quality harness.

Confidence Score: 5/5

The PR appears safe to merge; no actionable issues were found.

Summary

The PR makes the watcher batch test wait for its own root’s callgraph refresh.

• The watcher test waits for its own project root's refresh.

_{Reviews (2) · Last reviewed commit: "release notes and search-quality descrip..." · Reviewed by Greptile}