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Front A (Phase 1): tasks 1.1-1.6 done. t1.9 partial (minor edits in 13 test files). t1.10 docs done (12 files). t1.7/t1.8/t1.11 BLOCKED on mock-provider design decision. Phase 2: t2.1, t2.2, t2.3, t2.5 done. t2.4/t2.6/t2.7/t2.8/t2.9 deferred to follow-up track. Phase 3: t3.5 partial (to_legacy_dict dead code deleted; _push_mma_state_update has 4 callers so kept). t3.7 done. t3.8 partial (4 audits pass; full tier-1 batch not run in this session). t3.1/t3.2/t3.3/t3.4/t3.6 deferred (large typed-dataclass migrations). VC1-VC5, VC10, VC12 verified. VC6-VC9, VC11 pending follow-up.