## Summary
- include the server-validated Case ID in every V9 agent message
- require rectification tools to reuse that exact value
- add a regression test and BUG-170 record
## Verification
- `tsx --test tests/rectification-v9-agent.test.ts tests/rectification-v9-stream.test.ts` (23 passed)
- targeted ESLint passed
- `git diff --check` passed
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Summary
Verification
tsx --test tests/rectification-v9-agent.test.ts tests/rectification-v9-stream.test.ts(23 passed)git diff --checkpassed