docs(weather): normalized-substrate reference — palette256 × helix360 - #917
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…x360, meticulously sourced New knowledge doc .claude/knowledge/weather-normalized-substrate.md: the product/engineering reference for weather AI on the substrate, written after the operator-corrected helix arc. Every code claim carries file:line and a [G]/[H]/[S] grade; absences are stated as [G-absence]; measured numbers carry their conditions and are flagged not-yet-re-runnable until the probes land. Contents: - Doctrine: one arctanh core, two readings (fisher z statistics / 2z Poincaré arc length); normalized-low-entropy is the stored form, geometry is hydratable on demand — hyperbolic_depth exposed-but-uncalled is design. - helix360 precisely: 4-stage pipeline, ResidueEdge (3 B) + Signed360 (6 B) wire shapes incl. the codex #498 sign-partition regression, the ValueTenant::HelixResidue lane (U8×6 @ offset 112) whose 2×24-bit reading IS wind in/out, and the curve-ruler hydration principle. - palette256 precisely: RollingFloor mechanics with the honest loss accounting (±0.195% span), calibration loop, the version contract; DistanceLut linear/from_floor metric-safety. - Floor scoping RESOLVED as a policy decision (shared canonical z-floor vs per-variable vs hybrid), with the Lance-version alignment proposal [S] and probes P2/P3/P6 gating it. - Per-variable weather mapping [H]; measured-evidence ledger (blosc 1.27x, Lance 1.00x verbatim on 512 B rows, BF16 anomaly 97x, from!=to 90.2% / 15.50 deg, wind_speed Jensen-gap non-derivability, u8 bearing ~8x under obs error); economics (inbound tax once); ingest spec; verification battery (jc vs ndarray mirror divergence, Jirak rule); probe queue P1-P6; and the five-entry correction ledger from this arc. Board hygiene (same commit): EPIPHANIES prepend E-HELIX360-IS-THE-NORMALIZED-SUBSTRATE-NOT-A-BIT-BUDGET-1; weather plan §0 gains append-only ⊘ C3 correcting the invented Zarr object name to the session-verified 1959-2023_01_10-full_37-1h-0p25deg-chunk-1.zarr. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CcpLeEC3XK8Eye53GKBVvi
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Post-merge board hygiene for #917 (a CONTENT PR — new knowledge doc + two corrections — so it carries the full merged-PR obligation, not the hygiene-only termination clause). - LATEST_STATE PREPEND: what #917 establishes about already-shipped code (no new types) — the z-vs-2z reading split, helix360 as the existing HelixResidue lane read 2x24 in/out, the [G-absence] pair-writer gap, and floor scoping resolved as an ingest policy with probes P1-P6 all NOT RUN. - PR_ARC PREPEND: Added / Locked / Deferred / Docs + Confidence, with a provenance note recording the five-correction arc and the meta-rule it produced (consult-don't-guess applies to one's own prior in-session statements). This commit is itself hygiene-only and therefore generates no further board obligation (CLAUDE.md termination clause). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CcpLeEC3XK8Eye53GKBVvi
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…arvest-rfii13 docs(board): record merged #917 — normalized-substrate reference
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…d claims #920 merged with neither board file updated (0 references to it in either). This is the retroactive-hygiene pattern CLAUDE.md names as an anti-pattern — unavoidable once the PR is merged, and leaving the board stale is the worse outcome (the rule exists because #223/#224/#225 merged with no entries). PR_ARC_INVENTORY: prepends the #920 entry (Added / Locked / Deferred+WITHDRAWN / Docs / Confidence), and applies the file's own rules 3-4 to #917 — an appended Correction line plus an updated Confidence line, never an edit to its immutable Locked text. #917 had locked two claims #920 falsifies: that "helix360" names something (it does not — the type is Signed360, 12 blobs all from that session, zero deletions) and that the HelixResidue lane reads as 2x24 hemispheres = wind in/out (it does not — one Signed360 is already a complete full-sphere direction; rim is the metric carrier, (polar, azimuth) the render carrier). LATEST_STATE: prepends the #920 entry with the same correction as a leading supersession note. Also records a measurement made after the merge, in answer to an operator question about polar vs equatorial error rates. Signed360 angular error by latitude, N=65536: equator 0.112 deg mean / 0.226 max; pole 3.332 / 4.998 — a ~30x spread, best at the rim. And a correction to the premise: there is NO resolution gain from the sign split at equal bit budget — 7-bit |y| + sign vs 8-bit over [-1,1] measures 0.99-1.02x in every band (step 1/127 vs 2/255 = 0.996x). The 256-sample codebook figures that imply a sqrt(2) gain (full sphere cap 7.17 deg vs hemisphere 5.07) spend an EXTRA bit; at equal budget 128-on-hemisphere is 7.17, identical. What the partition buys at the rim is sign EXACTNESS, not precision — and that is exactly where weather lives, since a wind bearing is near-horizontal (y = 0), the regime where a centred-at-128 round loses the hemisphere (#498). Per the termination clause, this hygiene-only commit generates no further board obligations of its own. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CcpLeEC3XK8Eye53GKBVvi
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What
New knowledge doc
.claude/knowledge/weather-normalized-substrate.md— the product-lead / weather-AI-developer reference for the substrate, written after the operator-corrected helix arc. Docs-only; no code changes.Every claim is graded (
[G]code-verified with file:line ·[G-absence]verified absent ·[H]measured this session, probe not yet committed ·[S]proposal), per the falsifiability rule and "no unmarked conjectures".Contents
arctanhcore, two readings: fisher z (variance-stabilizing statistic) / fisher 2z (Poincaré-disk arc length). The stored form is normalized low-entropy, never materialized geometry —hyperbolic_depthexposed-but-uncalled is the design. Normalization is what puts unlike variables on one scale ("correlate what normally can't be correlated") and what makes u8 sufficient.ResidueEdge(3 B) +Signed360(6 B) wire shapes incl. the codex feat(contract): GUID decode→read-mode keystone + helix Signed360 right-size + OCR→NodeRow transcode #498 rim-sign-partition regression; theValueTenant::HelixResiduelane (U8×6 @ offset 112) whose 2 × 24-bit reading IS wind in/out; curve-ruler hydration (endpoints only, interior regenerates).RollingFloormechanics + honest loss accounting (±0.195 % span), calibration loop, the floor-version contract;DistanceLutmetric-safety (128 KB, O(1)).[S], gated by probes P2/P3/P6.<f4, quick-vs-permanent framing), verification battery (jc vsndarray::hpc::reliabilityOption<f64>-vs-0.0-sentinel divergence; Jirak rule for any significance claim), probe queue P1–P6, and the five-entry correction ledger from this arc so the next session doesn't repeat it.Board hygiene (same commit)
EPIPHANIES.mdPREPEND:E-HELIX360-IS-THE-NORMALIZED-SUBSTRATE-NOT-A-BIT-BUDGET-1weather-substrate-poc-v2.md§0: append-only ⊘ C3 correcting the invented Zarr object name to the session-verified1959-2023_01_10-full_37-1h-0p25deg-chunk-1.zarrBranch note
The prior PRs from this branch (#915, #916 arc) are merged; branch restarted from
origin/mainper protocol (fast-forward push, no history rewritten).🤖 Generated with Claude Code
https://claude.ai/code/session_01CcpLeEC3XK8Eye53GKBVvi
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