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The first end-to-end test of the tier2_autonomous_sandbox_20260616 sandbox. Pure mechanical rename: ai_client.send_result to ai_client.send across 38 active files (6 src/, 29 tests/, 3 current docs). 10 atomic commits across 5 phases. No behavior change; no new tests; the existing test suite is the safety net. Phase structure: - Phase 1: rename src/ai_client.py (TDD red moment) - Phase 2: rename 5 other src/ files (batch) - Phase 3: rename top 5 test files (one commit per file) - Phase 4: rename 24 remaining test files (batch) - Phase 5: rename 3 current docs + final verification - Phase 6: update state + metadata + register in tracks.md Historical archives (conductor/tracks/*/spec.md, conductor/tracks/*/plan.md, docs/reports/*) are NOT modified per spec section 7.