fix(claude): retract turns by target identity - #27
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Prefer the concrete orchestration turn id over stale Claude lifetime counts while preserving count-only validation. Persist the rebased resume cursor and cover retry, restart, and foreign-target safety.
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Claude Esc retraction could reject a valid active target when an older provider resume cursor reported fewer lifetime turns than T3s retained projection boundary. The rollback also left its updated native cursor only in memory until another provider operation.
This change makes Claude use the concrete orchestration target turn as the authoritative rollback coordinate, preserves all preceding local turns, and rebases the logical cursor afterward. Missing targets remain conservative unless the cursor is already at the requested boundary, and ProviderService persists the updated resume cursor before reporting rollback success.
Verification:
Implemented with GPT-5.6-sol through the Codex harness.