engineering.process.cpmk

• Golden tests 0 / 0
• Boundary tests 4 / 4
• Property tests 3 / 3
• Production surface contract 4 / 4
}
• Engine tested Yes
• Source checked Yes
• Artifact integrity PASS
• Production attestation Embedded snapshot: STALE · Last attested schema matched 1.0.0 snapshot / local build · Semantic contract ✓ · Last attestation PASS · current evidence changed · re-attestation required · Public/cache ✓ · Origin ✓ · Live production status PASS (0 stale; 164 CURRENT) @ 2026-09-16T06:44:24.909Z
• Semantic contract PASS
• Evidence attested at 2026-09-16T06:44:24.203Z
• Last production check 2026-09-16T06:44:24.203Z
• Public / cache PASS
• Origin PASS
• Supplemental domain review Not performed
• Named expert review Not performed

• release artifacts aligned PASS
• schema valid input executes PASS
• engine success output validates schema PASS
• schema rejects incomplete input PASS

Fingerprint sha256:45301a6db44ca0b48d43808b1fd35723349c5f376c995afbcc4680636d07b1bc

Input schema sha256:e5055fd2afc7d93270dab36473584409b9c9056ade0030f6b012630f7b658da7 · Output schema sha256:2f7d5bc94e11ab8b4a08d9ba09112e1e00a820396691a571acffb3766684446b · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Tool

cpmk

Engine

cpmk

Engine build

2026-09-16

Evidence core

2026-09-16T21:07:40.795Z

Rendered

2026-09-16T22:38:08.850Z

Last reviewed

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Assumptions

• Taguchi Cpmk = min(USL−μ, μ−LSL)/(3√(σ²+(μ−target)²)) from stated μ, σ, LSL, USL, and target.
• Not Cpm (two-sided span), not Cpk (no target in the denominator), not Ppm, and not a 1.33 verdict.

Limitations

• Design-stage from stated μ and σ — not measured in-control SPC
• Not Cpm (that uses the two-sided span USL−LSL)
• Not Cpk (Cpk has no target in the denominator)
• Not Ppm (that uses sample s)
• This page does not issue a Cpmk≥1.33 verdict