fix: usage-gate count-triggered tier nudges - #238
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Count-based tier distillation (tier2Trigger/tier3Trigger) fired at any usage once enough blocks accumulated. Below the nudge usage band there is no need yet, and the injected suggestion made repetition-prone models flail against the tier3-rewrite guard. Gate the count paths behind nudge.minContextLimitPct (the same band the first-sight bypass uses); token-mass paths (>= 1.5x threshold) stay ungated. The idle reason now labels gated tiers as 'usage-gated' so acp_status explains the silence.
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This was referenced Sep 9, 2026
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Fixes #237
nudge.minContextLimitPct— count-triggered T2/T3 distillation no longer fires below the usage band (was: any usage once 5 blocks exist).t2Pen >= tier2Threshold, 1.5× threshold) stay ungated — crossing them is need by itself.reasonnow labels count-ready-but-gated tiers:ready: T2 8 blocks (count, usage-gated)— acp_status explains why nothing injected.Production repro (session 01a07b3c, 2026-09-09 14:41): T2 nudge injected at 43% usage / 5872 pending tokens → model flailed → user saw repeated injections. With this gate the injection is suppressed; the mass still shows as
usage-gatedin status.Tests: 2 new (#237) + full suite 631 pass; typecheck clean.