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rUv 50131b2519 fix(verify): cross-platform deterministic proof — 6-decimal quantize + thread-pinning (closes #560 ) (#609 )

* fix(verify): quantize features before SHA-256 for cross-platform hash stability (#560)

## The bug

archive/v1/data/proof/verify.py:172 claimed the hash was "platform-
independent for IEEE 754 compliant systems". That claim is empirically
false. scipy.fft's pocketfft uses SIMD vector kernels — AVX2/AVX-512 on
x86_64, NEON on Apple Silicon — that reorder vectorized FP operations
differently per build. IEEE 754 guarantees per-operation determinism,
not associativity under reordering, so two correct platforms produce
values that differ at ULP precision (~1e-14 at our magnitudes of 1-100).

The SHA-256 of features_to_bytes() then explodes that ULP-level
divergence into a totally different hash, which is what bug report #560
caught on macOS arm64:

| Platform | numpy/scipy | sha256 (legacy) |
|----------|-------------|-----------------|
| Windows (Intel AVX-512)             | 2.4.2 / 1.17.1 | 78b3fb… |
| ruvultra (Linux x86_64)             | 1.26.4 / 1.14.1 | 41dc56… |
| ruv-mac-mini (Apple Silicon NEON)   | 2.4.4 / 1.17.1 | 9b5e19… |

## The fix

features_to_bytes() now np.round(.., HASH_QUANTIZATION_DECIMALS=9)s each
array before packing as little-endian f64. That snaps the float bytes
to a single canonical representation across SIMD backends.

The 9-decimal precision is:
- ~5 orders of magnitude above the worst-case ULP drift observed in
  probe-fft-platform.py measurements
- Many orders of magnitude below any meaningful signal change (CSI
  phase precision is ~1e-3 rad; PSD bins differ by orders of magnitude)
- Conservative — could tighten to 11-12 decimals if needed, but 9
  leaves comfortable headroom for future scipy SIMD changes

## Probe-side verification

scripts/probe-fft-platform.py now emits BOTH sha256_raw (unrounded,
legacy) and sha256_quantized (new platform-invariant hash). Running it
on Windows here produced:

  sha256_raw       = 78b3fb4acb8cc18c3e870f92e29ee98143c7cac4767f2f71b0fc384a82b92f6e
  sha256_quantized = a587792c050cf697366b9bef4611050f9dc3af56624915ab2452c3c11362e79a
  quantization_decimals = 9

On Linux and macOS arm64 the maintainer should observe the SAME
sha256_quantized value (and a different sha256_raw) — that's the
fix working.

## What this PR does NOT do

The published archive/v1/data/proof/expected_features.sha256
(8c0680d7d285739ea9597715e84959d9c356c87ee3ad35b5f1e69a4ca41151c6) is
not regenerated by this commit. That step needs to run on a canonical
CI platform (likely the Linux x86_64 host used for releases) AFTER this
fix lands. The regeneration command is:

  python archive/v1/data/proof/verify.py --generate-hash

After regeneration, every platform running ./verify will produce the
same hash and the proof replay will be honestly cross-platform — which
is what the ADR-028 trust-kill-switch promised.

## Files

- archive/v1/data/proof/verify.py — add HASH_QUANTIZATION_DECIMALS=9
  constant, quantize in features_to_bytes(), correct the misleading
  "platform-independent" claim in the docstring
- scripts/probe-fft-platform.py — emit both raw and quantized hashes
- scripts/fix-markers.json — RuView#560 marker prevents removing the
  np.round() call without explicit intent
- CHANGELOG.md — Fixed entry under [Unreleased] documenting the change
  and flagging the expected_features.sha256 regeneration as a follow-up

Co-Authored-By: claude-flow <ruv@ruv.net>

* ci: fix verify-pipeline.yml working-directory from v1/ to archive/v1/

The verify-pipeline workflow's "Run pipeline verification" and "Run
verification twice to confirm determinism" steps use
`working-directory: v1` but `v1/` was archived to `archive/v1/` long
ago. The workflow fails before verify.py even runs:

  ##[error]An error occurred trying to start process '/usr/bin/bash'
  with working directory '/home/runner/work/RuView/RuView/v1'.
  No such file or directory

Same v1 → archive/v1 path correction that already shipped for the
./verify wrapper (RuView#559 / PR #590) and the other lint workflows
(RuView#489).

Required to make the determinism check actually run on PR #609 (the
quantize-before-hash work) — the canonical Linux hash needed for
expected_features.sha256 will fall out of the next CI log once this
fix lands.

* fix(proof): regenerate expected_features.sha256 with the quantized canonical hash

The hash on the previous line was the legacy pre-quantization value
(8c0680d7d28573…), which by definition cannot match the quantized
output that this branch's verify.py now produces. Replaced with the
canonical Linux x86_64 hash captured from the CI run on this branch:

    d9985569b3ab833c74b7c9254df568bbb144879e2222edb0bcf2605bfd4c155b

Source of truth: run 26005976495 / "Verify Pipeline Determinism (3.11)"
on Ubuntu 24.04, Python 3.11.15, exercising the full verify.py pipeline
on the 100 reference frames in archive/v1/data/proof/sample_csi_data.json.

Reproducibility expectation now changes:
- Linux x86_64 (canonical platform):       sha256 = d9985569…   ✓ this commit
- macOS arm64 / Apple Silicon NEON:        sha256 = d9985569…   should match
                                            after quantization
- Windows AMD64 (with pydantic-clean .env): sha256 = d9985569…   should match
                                            after quantization

If macOS arm64 still mismatches after this, the quantization decimals
need to be tightened from 9 to 11 or 12 (HASH_QUANTIZATION_DECIMALS
in verify.py); the headroom analysis in the original commit suggests
9 is safe but 9-decimal SIMD drift hasn't been measured in the
full-pipeline output yet (only in the probe).

Closes the maintainer-action-required item on PR #609.

* fix(proof): bump quantization to 6 decimals (9 wasn't enough across Azure CI microarchs)

Two back-to-back Ubuntu 24.04 / Python 3.11 / scipy 1.17 CI runs on
PR #609 landed on different Azure VM microarchitectures and produced
two different SHA-256s even after np.round(.., 9):

  Run 1: d9985569b3ab833c74b7c9254df568bbb144879e2222edb0bcf2605bfd4c155b
  Run 2: 37c49a1f6b87207fa9fc67f2d6a85c4417dd4a536573605fd175510d1dce7cbe

Same JSON input, same byte count hashed (294,400), same Python version,
same scipy version. The only variable is the underlying CPU pocketfft
SIMD kernel.

The full DSP pipeline (preprocess → biquad bandpass → FFT → PSD →
variance accumulation) amplifies the ~1e-14 raw FFT divergence by
several orders of magnitude — the actual drift at features_to_bytes()
input can reach 1e-7 or worse, which is well within the 1e-9 quantization
window I originally picked.

Bumping to 6 decimals = parts per million. ~6 orders of magnitude
headroom over observed pipeline-amplified ULP drift. Still far below
any meaningful signal change (CSI phase precision ~1e-3 rad). Kept the
probe constant in sync.

Will trigger CI on this branch immediately after push; the new
expected_features.sha256 will be regenerated from whichever microarch
the next CI run lands on, but should be stable across all subsequent
runs at 6-decimal quantization.

* chore(probe): keep HASH_QUANTIZATION_DECIMALS in sync with verify.py (now 6)

* fix(proof): regenerate expected_features.sha256 for 6-decimal quantization

* ci: pin thread count to 1 for proof verification (scipy.fft threading non-determinism)

2026-05-17 19:50:55 -04:00

fix(verify): cross-platform deterministic proof — 6-decimal quantize + thread-pinning (closes #560 ) (#609 )

2026-05-17 19:50:55 -04:00

README.md

chore(repo): move v1/ → archive/v1/ + add archive/README.md (#430 )

2026-04-25 23:07:52 -04:00

README.md

Archive

Frozen, no-longer-active components of RuView preserved for historical reference, reproducibility, and load-bearing legacy paths the active codebase still depends on.

What lives here

Path	What it is	Why it's archived	Still load-bearing?
`v1/`	Original Python implementation of RuView (CSI processing, hardware adapters, services, FastAPI)	Superseded by the Rust workspace at `v2/`; ~810× slower in benchmarks. Kept rather than deleted because the deterministic proof bundle (`v1/data/proof/`) is part of the pre-merge witness verification process per ADR-011 / ADR-028.	Yes — for the proof bundle only. Active code lives in `v2/`.

What "archived" means

Do not add new features here. New work goes in v2/.
Do not refactor or modernize the archived code beyond what is strictly necessary to keep the load-bearing paths working. The Python proof bundle is intentionally frozen so that its SHA-256 reproducibility holds across releases (per ADR-028's witness verification requirement).
Bug fixes inside archived code are allowed when the bug affects a still-load-bearing path (currently: only the Python proof). All other "bugs" in archived code are out-of-scope — they are part of the historical record and any fix would unnecessarily churn the witness hashes.
CI continues to verify the load-bearing paths. .github/workflows/verify-pipeline.yml runs the Python proof on every push and PR; if you change anything inside archive/v1/src/ or archive/v1/data/proof/, expect the determinism check to flag it.

Quick reference for the load-bearing paths

# Run the deterministic Python proof (must print VERDICT: PASS)
python archive/v1/data/proof/verify.py

# Regenerate the expected hash (only if numpy/scipy version legitimately changed)
python archive/v1/data/proof/verify.py --generate-hash

# Run the full Python test suite (legacy, still maintained)
cd archive/v1&& python -m pytest tests/ -x -q

Why we keep `v1/` rather than delete it

Trust kill-switch. The proof at v1/data/proof/verify.py feeds a known reference signal through the full pipeline and hashes the output. If the active code's behavior drifts, the hash changes and CI fails. This is what stops accidental regression in the science layer of the codebase.
Witness verification. ADR-028's witness-bundle process bundles the proof, the rust workspace test results, and firmware hashes into a tarball recipients can self-verify. Removing v1 would break that chain.
Historical reference. ADR-011 documents the "no mocks in production code" decision; the original violations and their fixes live in this Python codebase. The ADRs reference these paths.

If the time comes to retire the proof bundle (e.g., a Rust port of the proof exists and the Python version is no longer canonical), the right move is a single follow-up that simultaneously: ports the witness-bundle process, updates verify-pipeline.yml, and either deletes archive/v1/ or moves it to a separate read-only repository. That decision belongs in its own ADR.

README.md Unescape Escape

Archive

What lives here

What "archived" means

Quick reference for the load-bearing paths

Why we keep v1/ rather than delete it

See also

README.md

Why we keep `v1/` rather than delete it