Stable-key re-bank executed: flow anchor 6.5997 — ADOPTED (#18.2)

2026-08-06 ~08:3xZ. The pre-registered instrument break (pre-reg, band amendment σ_draw finalization) executed at the first eval boundary after the box-batch reads, as registered. One full-panel eval of flow-80k (bijou_flow_artrunk_h1024_40k_ddp2 @80k, Heun-30, N=1, seed 0, --noise-key stable), launched 07:41Z, scored 08:30Z (25,800 frames, ~650 f/min — the fastest panel pass this box has run); reads by the frozen protocol, in order:

1. Controls (hard gate): PASS. state-copy and state-copy-norm summaries are bitwise identical to the banked index-keyed report across every cell (chunk_mae, chunk_mse, first_mae, per-motor, p50/p90) — the keying change touched nothing outside the noise path.
2. Primary band: INSIDE — ADOPT. Stable-key chunk_mae 6.5997 vs band [6.4882, 6.7582] (= 6.6232 ± 3·0.045, the floor binding over σ_draw_direct 0.02367). Shift vs the index-keyed same-file comparator: −0.0242 ≈ 1σ_draw — an ordinary fresh draw of the same noise distribution, exactly the pre-registered expectation.
3. Secondary (quoted, not gated): first_mae 1.9355 (index-keyed 1.9335, +0.002); state-copy margin 5.185.

Qualitative check (the shape of the draw, not just the scalar): per-motor MAE moved coherently and tiny — index [4.43, 9.06, 9.27, 6.98, 5.55, 4.45] → stable [4.39, 9.01, 9.22, 6.91, 5.55, 4.52] (five of six motors a hair better, wrist-roll a hair worse); p50 4.91→4.96, p90 12.74→12.81. No motor, percentile, or baseline shows anything but draw-level jitter — the profile is the same model on the same frames under a fresh noise draw, which is exactly what a keying change must look like. Full trajectory renders: the eval’s HTML report (32 sampled frames).

What changes

• stable is now the quoted keying for all new flow numbers. The re-banked deployment-class flow anchor on panel v1 k4l2: chunk 6.5997 / first 1.9355 (Heun-30, N=1, noise-key stable). Index-keyed numbers stay valid as-labeled at frozen corpus; every banked npz remains its own paired-comparison reference.
• Ledger anchor row updated with the keyed pair; ideas #18.2 → banked/done.
• In-flight pre-registrations finish as registered (SnapFlow’s endpoint reads run per its own pre-reg; its adopt band ≤ 6.7732 was σ-finalized before this eval opened and is untouched by the re-bank).

Instrument note: this closes the noise-reseed amendment chain opened by the owner deep-dive’s finding 1 — corpus-index keying made every flow number hostage to corpus mutations; stable keying decouples them. Cost: one 49-min panel eval at a boundary the queue had to visit anyway.