RP003 — Pre-execution implementation review

2026-10-11. Internal self-review before observing the target enumeration. The user requested continuation of the published bounded audit. This record authorizes no change to the frozen baseline or operational criteria.

The implementation reads AUDIT_CONFIG.json: 10 ordered states, path lengths 2–4, repetition allowed, inclusive epsilon = B = 1, 11,100 expected paths. It records every path with exact measurements, antecedent denominators, counterexample counts and the first witness in the declared order. Seven implications are audited: local-to-endpoint, local-to-prefix and endpoint-to-prefix for each of exact-feature and tolerance signatures, plus variation-budget-to-tolerance-prefix. The latter is the specified sufficient bound; it is not tested as a necessary condition.

The main evaluator uses rational arithmetic. Independent replay uses integer quarter-units and base-10 ordinal decoding, does not import the main evaluator, and checks every row's domain, order, measurements, aggregate counts and first witnesses. The quarter scale covers both the half-unit grid and independent 3/4 calibration fixtures exactly. Coverage is checked against declared ordinals, rather than trusting a producer-supplied count. Positive controls must have zero failures. The immutable input snapshot includes the reviewed Git commit, SHA-256 of protocol, configuration, fixtures, implementation, runner and collision review, and environment before any enumeration output.

Pre-execution engineering tests use only four two-state paths on {A} × {0,1/2}, the disclosed P0–P3 controls, and deliberately corrupted/truncated rows. They do not calculate the target 11,100-path outcome counts. Checks cover guard termination and mismatch rejection. No statistical test or novelty conclusion is planned. Run ID is audit-20261011-001; command: python3 scripts/run-rp003-audit.py --run-id audit-20261011-001.

One process, no network, Python >= 3.11, a 60-second timer and peak resident memory ceiling of 128 MiB apply to enumeration and independent replay together. Resource guards run at startup, every 128 rows and completion; the process high-water mark catches temporary memory peaks at the next guard. Partial files and failure metadata remain INCOMPLETE. Existing run directories are refused. Final manifest checksums are filled only after output creation; once committed, all run bytes remain immutable. Outcome review and a separate valid Result require complete replay and matching hashes. This review does not close RP003 or advance the Cycle ring.