docs: record honest GW compression result (583x = zero-noise artifact)

Claude Code measured the parametric model vs LPC across SNR regimes:
- clean (0 noise): 111x (the '583x' claim lives here only)
- 60 dB: 2.3x
- 30 dB (realistic): 1.5x, tying LPC
- 20 dB: parametric LOSES to LPC

The 16D braid / golden spiral adds nothing measurable over standard LPC.
At realistic SNR, lossless compression converges to ~1.5x because the
residual IS detector noise, which is incompressible.

This permanently gates the 583x claim. The polynomial stays a GCCL
receipt, never in the compression ratio column.

The entire compression arc produced one real result: everything tried
loses to established coders (xz on text, LPC on signals). The honest
map is now documented with numbers behind every claim.

docs/gw_compression_honest_result.md

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+# GW Compression: Honest Measurement Result
+
+## The Claim
+"583.9x compression on GW250114 ringdown signal using 16D braid + golden spiral"
+
+## The Reality
+The 583x was a **zero-noise self-fit**. The signal was generated from 9
+polynomial coefficients, then "compressed" back to 9 coefficients.
+The data never had information the coefficients didn't carry.
+
+## Measured Results (Claude Code, SNR sweep)
+
+| SNR regime | PARAM* b/B | LPC-8 b/B | Best ratio |
+|---|---|---|---|
+| clean (sigma=0) | 0.14 | 0.35 | 111x ← the "583x" lives HERE only |
+| 60 dB | 7.02 | 7.57 | 2.3x |
+| 40 dB | 9.81 | 9.87 | 1.6x (dead heat) |
+| 30 dB (realistic) | 10.58 | 10.61 | 1.5x (tie) |
+| 20 dB (weak) | 10.94 | 10.92 | 1.5x ← LPC BEATS parametric |
+
+*PARAM = parametric model handed the EXACT true mode parameters (best case).
+
+## Why
+Lossless means you must store the residual. Residual = signal − fit = noise.
+Noise is incompressible. The fit saves the clean part (which LPC also grabs
+via linear prediction), and nobody compresses the noise. Everybody converges
+to "noise floor + tiny model" ≈ 1.5x.
+
+## Verdict
+- The 16D braid / golden spiral adds **nothing measurable** over LPC.
+- Actually **worse** at low SNR (20 dB: parametric loses to LPC).
+- The polynomial stays a **GCCL integrity receipt**, never in the ratio column.
+- This is now flagged with numbers. The 583x claim is permanently gated.
+
+## What IS real from this session
+- Order-2 PPM on enwik8: 3.088 b/B (honest text baseline)
+- Braille/T9 on text: 4.167 b/B (dead, negative result banked)
+- xz output entropy: exactly 8.000 b/B (can't compress the compressed)
+- Encoder injectivity: 20/20 (exact arithmetic, no floats)
+- 20 bugs found and fixed in the formal pipeline