# Modular Runtime Phase 4 — Combined Autonomous System Canary 01

Date: 2026-08-01

Status: accepted live system review

Execution time: 270.316 seconds

## Accepted outcome

One unattended long-build run connected the complete Phase 4 path: an automatic two-worker implementation wave, one recoverable batch promotion, forced controller loss, exact warm-cache recovery, milestone checkpointing and compaction, one real bounded Sol horizon renewal, a third Luna implementation, direct integration replay, and terminal summary compaction.

No human checkpoint, worker retry, duplicate planner call, duplicate implementation call, or second authority was used.

## Exact route

| Responsibility | Route | Calls |
|---|---|---:|
| Initial accepted horizon | deterministic fixture, isolating the runtime transition | 0 model calls |
| Core implementation | `gpt-5.6-luna/xhigh` in two isolated worktrees | 2 |
| Horizon renewal | `gpt-5.6-sol/high`, read-only | 1 |
| Handoff implementation | `gpt-5.6-luna/xhigh` in one isolated worktree | 1 |
| Scheduling, restart recovery, cache admission, checkpointing, compaction, and integration | deterministic controller | 0 model calls |

The first two workers implemented `person-summary` and `care-priority` from the same accepted base. They overlapped for 104.187 seconds. Their observed durations sum to 220.811 seconds while the concurrent span was 116.624 seconds, a measured 1.893× worker-lane speedup for this exact wave.

## Forced-restart sequence

1. The long-build controller started the two dependency-safe Luna workers without claiming the integration queue.
2. The controller sealed both exact one-file candidates and claimed one two-member epoch.
3. The trusted batch adapter executed three cold checks, created one deterministic union, and advanced Git authority once.
4. The canary intentionally interrupted after Git promotion but before the SQLite receipt.
5. The database and controller closed and reopened.
6. Recovery reconstructed the same epoch and union, executed zero model calls, and reused all three exact verification results.
7. The controller accepted both nodes atomically, checkpointed the core milestone, and replaced its accepted detail with one content-addressed summary.
8. One real Sol/high renewal promoted exactly the next coarse `care-handoff` milestone into the detailed window.
9. One bounded Luna/xhigh worker implemented only `care-handoff`; the direct integrator ran two cold checks and advanced authority once.
10. An exact direct replay reused both checks with no command execution.
11. The final checkpoint compacted `care-handoff` and absorbed the active core summary into one terminal read-only summary while retaining both immutable summary records.

## Cache proof

| Boundary | Cold executions | Warm executions | Exact hits |
|---|---:|---:|---:|
| Recovered two-member batch | 3 | 0 | 3/3 |
| Direct handoff replay | 2 | 0 | 2/2 |
| Total | 5 | 0 | 5/5 |

Every warm hit retained the exact cold evidence SHA-256. The replay hit rate was 100%. The cache skipped only trusted command execution; clean-workspace, lineage, acceptance, and authority checks still ran.

## Durable terminal truth

- two first-parent Git promotions;
- two immutable milestone checkpoints;
- horizon revision advanced from 1 to 2 exactly once;
- zero planning or implementation calls repeated after reopen;
- final graph revision 11;
- final active graph contains one accepted, terminal, read-only summary node and no edges;
- immutable summary history contains the core summary and the final summary that absorbed it;
- the first summary preserves both boundary artifacts and all worker/cache evidence hashes;
- the final integration head is `1466e3f01b885c12dab18402d79df69dd5fd19fe`.

## Durable evidence

Evidence directory: [`evidence/MODULAR_RUNTIME_PHASE4_SYSTEM_CANARY_01`](./evidence/MODULAR_RUNTIME_PHASE4_SYSTEM_CANARY_01/)

`run-summary.json` SHA-256: `6a4b6ba58b8b828fa54b947aa66238734a85abd1f531e9207ebb0bc2f9adf0cb`.

The evidence document records worker identities and timestamps, measured overlap and speedup, cold and warm check receipts, checkpoint documents, both content-addressed summaries, final graph truth, exact integration heads, horizon revisions, and promotion count.

## Command

```text
NO_COLOR=1 RUN_LIVE_CODEX=1 \
PHASE4_SYSTEM_EVIDENCE_DIR=<absolute-evidence-path> \
pnpm --filter @orchestrator/modular-builder-core exec vitest run test/live-phase4-system-canary.test.ts --reporter=verbose
```

Result: 1/1 passed in 270.316 seconds; the measured canary body completed in 270.272 seconds.

## Scope boundary

This canary accepts the Phase 4 long-build runtime. It does not grant release authority, prove a legacy-Core migration, archive legacy Core, or implement Hermes. Those remain Phase 5 and Phase 6 work.