[lu-zero]

kolibri1 TT b2ii: ratify and report the band gate as the P150 standard

The ratified standard

The developer ratified (2026-10-19) the band gate as the P150
correctness standard for the B2b-ii device token gate: a sequence is ON
iff it has ZERO hard flips — divergences inside the established
2.5-nat near-tie band are not gate failures; the exact-token ON/OFF
counting is no longer the bar; the primary oracle rows (the W3 141/145
CPU baseline) remain the denominator.

The scorer change

test_kolibri1_tt_b2ii.cpp now prints the band-gate verdict line
(BAND GATE (ratified 2026-10-19): X/Y sequences ON, with the worst
in-band divergence against the band edge) beside the unchanged
exact-token reporting. A reporting change, not a tolerance change: the
classifier — the per-position nat gap vs the golden greedy chain,
-gap <= kNatBand (band 2.5), tests/vllm/models/
test_kolibri1_tt_b2ii.cpp:1222 — is untouched.

Three-run verdict (origin/main 61d333e, P150, device recipe)

Byte-identical flip sets across all three runs per arm; the verdict is
stable, no flapping.

Arm	Band gate (ON sequences)	Exact token	Worst in-band	Margin to edge
HOST-FREE ON (default)	3/8 ×3 runs	3/11 (3 near-ties, 5 hard)	−1.747 nats	0.753 nats
HOST-FREE OFF (VT_TT_HOST_FREE_DECODE=0)	6/8 ×3 runs	12/20 (6 near-ties, 2 hard)	−2.157 nats	0.343 nats

Both exact-token counts reproduce the recorded 3/11 and 12/20 exactly.
No classifier defect: no flip beyond the band is recorded as a near-tie
on either arm (checked programmatically across the flip records).

What becomes gateable

Under the ratified standard the b2ii token gate has a STABLE, dated,
measured ON/OFF verdict (3/8 ON, 6/8 ON) instead of an exact-token
coincidence count. The gate is not yet "all sequences ON": the
hard-flip sequences (ON arm: Australia, Wissen, x1=, Ein gutes,
counting; OFF arm: der Mond, counting) stay owed, and the three
pre-existing assertion failures remain, documented: :1263
(argmax_matches >= 141), :1264 (hard_flips == 0), :1419
(instr_hard_flips == 0).

Records

• ISSUE-LOCAL-01M4P21TZ1Q9CA7P66XBH0BQTX — the 2026-10-19 ratification
  and rescore entry beside the recorded 3/11 / 12/20 numbers.
• .agents/specs/kolibri-tt.md ## Now — the lifecycle note.

Gates

• b2ii device token gate: 3 runs per arm, stable verdicts and
  byte-identical flip sets both arms.
• Host kolibri1 suite: 18/21; test_kolibri1_dequant_cache,
  test_kolibri1_w3, test_kolibri1_ngram_spec fail identically on
  pristine origin/main (verified on a clean 61d333e build) —
  pre-existing on this host.
• scripts/check-agent-record.py: OK.
• scripts/agent-preflight.sh --staged: green except
  check-windows-portability.py, which fails identically on pristine
  origin/main (pre-existing, environment).
• scripts/check-commit-style.py and the trailer suites: OK.

FOLLOWING_AGENTS_PROTOCOL

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Assisted-by: AGENT:zai/glm-5.3-flash [maki]