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ed 4e94780470 test(provider_state): add migration regression-guard suite
TIER-2 READ AGENTS.md conductor/workflow.md conductor/edit_workflow.md conductor/tier2/githooks/forbidden-files.txt conductor/tracks/tier2_leak_prevention_20260620/spec.md conductor/code_styleguides/data_oriented_design.md conductor/code_styleguides/error_handling.md conductor/code_styleguides/type_aliases.md before Phase 0 Task 0.3.

Phase 0 of code_path_audit_phase_3_provider_state_20260624. 14 regression-guard tests covering ProviderHistory API:
- 6 providers reachable as singletons
- append/get_all/clear/replace_all ordering preserved
- RLock re-entrancy in with-block (nested function call)
- concurrent append thread-safety (2 threads x 100 msgs = 200 unique)
- defensive copy semantics of get_all()
- __bool__/__len__/__iter__/__getitem__ dunders per provider
- clear_all() resets all 6 providers
- KeyError on unknown provider

All 14 tests PASS on current state (aliases still present; ProviderHistory API reachable).

Conventions: 1-space indentation, CRLF, no comments, from __future__ import annotations.
2026-06-25 12:03:02 -04:00