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M5 report: documentation and self-counts

Run stamp: 2026-09-01, sixth commit of this repository, the run of python3 tools/check-self-counts.py recorded below. The ladder's last milestone: nothing new is built here; what exists is counted, and the counting is itself checked.

The scanner

tools/check-self-counts.py: every load-bearing number in the docs matched by a pattern that must hit its stated count, compared with a fresh measurement. Measured sources: the exact rationals recomputed with fractions; the transcription gate re-run; the data files re-parsed; the frozen comparison constants read from the crate that owns them; the workspace membership counted; the cargo suite and its MUTATE=1 run executed and their totals parsed (--fast skips those two rows; REQUIRE_ALL=1 makes a skip a failure). Deliberately NOT covered, stated in its header: throughput and diff-envelope figures, which are stamped best-of-N measurements that re-running here would replace with noisier ones.

The scanner paid for itself on its first run: the published bar column in the M2 test and report carried 68.9 IRE for the yellow bar where the derivation gives 68.97; the correct one-decimal value is 69.0, and M2's justified 1-IRE waveform tolerance had absorbed the typo. Fixed in both places; the scanner now holds the column to the derivation at 0.06 IRE. It also found NOTICE.md claiming "pinned by hash" without quoting the hash; the hash is now quoted.

Final run: 56 claims verified, 0 failures, 0 skipped (the slow rows measured 56 tests green and 33 MUTATE reds, matching README and the M4 report).

Licences per data source

NOTICE.md is the per-source registry, one entry per data file and vendored oracle with its terms and pinned hash; each data file also carries its own provenance header. Recorded decision: a single annotated registry satisfies the spec's "licence file per data source" better than a directory of stubs would, because the registry is the one place a reviewer already looks.

Known divergences

Consolidated into docs/divergences.md: the blargg table with magnitudes, the ST 170M simplifications, the nesdev differential-phase non-model, and the internal deliberate choices, each pointing at the report or module doc where it was measured or recorded.

The spec, handed back

docs/spec-v0_3-draft.md: the three corrections that failed confirmation (the full-frame rate, Rung D, the bandwidth clause), the additions the implementation needed, v0.2's open questions all resolved, and three new questions for the director, the first being the hardware the real-recording gate waits on.

The ladder, closed

M0 through M5 in six commits, one day: the grid contract with every residue proven; the NES encoder held to the page's own waveform; Rung A against blargg with every disagreement attributed; the RGB encoder against the primary standard's own clauses; four separation rungs, one of them refused by name and one corrected against the spec; the CRT model honest about being one; the capture source earning its phase; and this scan. Open at the end, all recorded: the real capture recording (hardware), the arcade shell (the companion project), real-time throughput (the named decimation and SIMD levers), and the v0.3 ratification.

Pulled at build time from ntsc-crt/docs/m5-report.md; the repository is the one copy.