feat(run): pair dispatch lifecycle observations

[solomonneas]

Summary

• record each worker dispatch as requested before the external call, then observed and completed or failed after the call returns
• attach the selected seat and a monotonic attempt to every new dispatch fact
• serialize every checkpoint and paired event across worker, interrupt, and status writers
• surface an unmatched dispatch request as at-least-once recovery work in runs recover and Doctor
• preserve legacy dispatch projections while assigning aggregate dispatch and result-processing transitions their own event types
• keep authoritative checkpoint recovery and shadow parity exact across dispatch crash windows

Issue #568 acceptance criteria

• requested external work is synced before the action and terminal observation is synced afterward: test_dispatch_callbacks_follow_each_external_result_and_keep_attempt_identity
• dispatch facts carry real seat and attempt values across parallel and repeated work: test_dispatch_facts_pair_each_real_attempt_without_reusing_pending_identity and test_lifecycle_run_dispatch_emits_only_identified_worker_dispatch_facts
• requested work without a terminal observation is surfaced as at-least-once recovery: test_runs_recover_prints_pending_dispatch_only_after_validated_recovery and test_doctor_validates_checkpoint_before_reporting_pending_dispatch
• checkpoint pairing binds event type, seat, and attempt and rejects incomplete or substituted pairs: test_recover_from_checkpoint_rejects_mismatched_dispatch_pairing_identity and test_recover_rejects_dispatch_pairing_checkpoint_at_tail_as_incomplete
• authoritative recovery restores the projected tail and shadow parity catches up only one verified pair: test_authority_dispatch_checkpoint_is_base_stripped_and_recovers_exact_tail and test_authoritative_status_write_catches_up_final_dispatch_pair_before_append
• legacy identity-less dispatch events remain readable while old shadow artifacts become stale under projector v4: test_identified_dispatch_fact_does_not_advance_aggregate_status and test_dispatch_semantics_v4_quarantines_old_v3_shadow_artifact

Verification

• ./scripts/verify
• 5360 passed, 3 skipped
• coverage: 83.06%
• Brigade receipt: 20260730-204031-work-verify-62bb15
• independent closure review: clean

Refs #568

[coderabbitai]

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