phase4: COMPLETE — service latency win + mechanical ROI report; roadmap done

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phase4-cjson-service (ledger): the accepted batch win phase3-cjson-002
measured under a 150 rps coordinated-omission-correct replay (20 rounds,
40k requests, 0 drops). p50 latency +6.2%, 95% CI [+5.8%, +7.2%] —
accepted; p99 CI [0.07, 4.97] too noisy (single-worker loopback tail),
harness correctly rejected. ROI (500-core fleet, $0.04/core-hr): 27.5
cores / $9,621/year at the CI lower bound, report generated mechanically
(results/phase4/cjson-service-roi.md).

- results/phase4/: case study + README + the generated ROI report.
- CLAUDE.md: Phase 4 complete; Phases 0-4 all done.

All SPEC §5 exit criteria met across every phase; zero shipped false
accepts across the whole project.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EcKPWQ3MQD4NdEHwar96u2

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Claude

2026-07-11 23:48:22 +00:00

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results/ledger.sqlite

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