refactor: split runtime state ownership

[Nek-12]

Summary

• Split runtime and registry state ownership into focused subdomain owners for registry coordination, runtime state stores, transcript persistence, and compaction planning/execution/persistence/reminders/carryover.
• Added invariant/state-machine regression tests for new stores, self-deadlock guard, model/tool cancellation, prompt close/cancel semantics, and compaction durable-before-memory ordering.
• Rebased on top of main.

Verification

• ./scripts/test.sh ./server/runtime ./server/registry -count=1
• ./scripts/build.sh --output ./bin/builder
• git diff --check
• push hook: formatting, go vet, go build, test

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 49947be2-c639-43a7-ac67-aaa50adeb75e

📥 Commits

Reviewing files that changed from the base of the PR and between 5e0e755 and a115a0b.

📒 Files selected for processing (56)

• server/registry/pending_prompt_store.go
• server/registry/primary_run_lease_store.go
• server/registry/prompt_activity_broker.go
• server/registry/runtime_directory.go
• server/registry/runtime_registry.go
• server/registry/runtime_registry_test.go
• server/registry/session_activity_broker.go
• server/runtime/committed_transcript_events_test.go
• server/runtime/compaction.go
• server/runtime/compaction_carryover.go
• server/runtime/compaction_executor.go
• server/runtime/compaction_persistence.go
• server/runtime/compaction_planner.go
• server/runtime/compaction_reminder.go
• server/runtime/compaction_runtime_state.go
• server/runtime/compaction_utils.go
• server/runtime/diagnostic_dedupe_store.go
• server/runtime/engine.go
• server/runtime/engine_message_ops.go
• server/runtime/engine_part11_test.go
• server/runtime/engine_part12_test.go
• server/runtime/engine_part13_test.go
• server/runtime/engine_part14_test.go
• server/runtime/engine_part15_test.go
• server/runtime/engine_part4_test.go
• server/runtime/engine_part8_test.go
• server/runtime/engine_part9_test.go
• server/runtime/engine_queue_submission.go
• server/runtime/engine_request.go
• server/runtime/engine_state.go
• server/runtime/engine_state_deadlock_test.go
• server/runtime/goal.go
• server/runtime/goal_loop_state.go
• server/runtime/goal_test.go
• server/runtime/handoff_runtime_state.go
• server/runtime/locked_contract_state.go
• server/runtime/message_lifecycle.go
• server/runtime/model_cancellation_test.go
• server/runtime/model_request_runtime_state.go
• server/runtime/orchestration_collaborators.go
• server/runtime/pending_tool_call_starts.go
• server/runtime/phase_protocol.go
• server/runtime/phase_protocol_state.go
• server/runtime/queued_user_messages.go
• server/runtime/request_cache_lineage.go
• server/runtime/request_cache_lineage_test.go
• server/runtime/reviewer_runtime_state.go
• server/runtime/state_stores_test.go
• server/runtime/status_inspection.go
• server/runtime/step_executor.go
• server/runtime/system_prompt_snapshot.go
• server/runtime/tool_executor_cancellation_test.go
• server/runtime/transcript_persistence.go
• server/runtime/transcript_runtime_state.go
• server/runtime/usage_tracking_state.go
• server/runtime/worktree_reminder_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch td-06

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[chatgpt-codex-connector]

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