PR #369 was merged before the final Codecov coverage fix landed, so this follow-up carries only the incremental real-path tests needed on top of main. The tests exercise AgentSummary lifecycle branches, mailbox fail-closed behavior, UDS client connection failure through a real capability file, and UDS response-reader framing without mock.module, warning suppression, feature fallback, or production-code churn.
Constraint: PR #369 is already merged; this branch must contain only the incremental Codecov repair on top of latest main
Rejected: Reopen or keep pushing the merged PR branch | merged PR refs do not update and would leave Codecov stale
Rejected: Mock bun:bundle or hide warnings | would reintroduce cross-test pollution and pseudo coverage
Rejected: Keep unrelated SendMessageTool production diff | it created avoidable patch-coverage debt without improving the runtime path
Confidence: high
Scope-risk: narrow
Directive: Keep these coverage tests on real paths; do not replace them with output suppression or feature-flag mocks
Tested: bunx tsc --noEmit --pretty false
Tested: bun run lint
Tested: bun test src\utils\__tests__\teammateMailbox.test.ts
Tested: bun test src\services\AgentSummary\__tests__\agentSummary.test.ts src\services\AgentSummary\__tests__\summaryContext.test.ts src\utils\__tests__\teammateMailbox.test.ts src\utils\__tests__\udsMessaging.test.ts src\utils\__tests__\udsResponseReader.test.ts packages\builtin-tools\src\tools\SendMessageTool\__tests__\udsRecipientSanitization.test.ts
Tested: bun run test:all
Tested: bun test --coverage --coverage-reporter lcov --coverage-dir coverage
Tested: bun run build
Tested: bun run build:vite
Tested: bun audit
Tested: git diff --check
Tested: Claude simplify review GO (.omx/artifacts/claude-simplify-codecov-20260427-1521.md)
Tested: Claude security review GO (.omx/artifacts/claude-security-codecov-20260427-1522.md)
Not-tested: GitHub-hosted Codecov upload after this amended commit until PR checks rerun
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