docs(testing): implementation plan for unified test/E2E/reporting/coverage pipeline
Plan derived from the approved 2026-07-01 design spec; covers scenario kind unification (chain/direct/recorder/debug/tcplogger), instrument-first double-run coverage, and DebugService/TCPLogger E2E via debugclient. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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