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262da50f98
CONTEXT_LIMIT was hardcoded at 200_000 tokens. Users on Claude Opus 4.7 with the 1M context window (model: "opus[1m]") saw the dashboard report 80–90% usage when actual usage was 16–18%, producing constant false alarms and making the meter unusable on long sessions. Replace the constant with _detect_context_limit(cwd) which resolves the limit in this order: 1. CONTEXT_TIMELINE_LIMIT env var (explicit override). 2. "[1m]" / "[1000k]" / "[200k]" suffix in the model field of <cwd>/.claude/settings.json or ~/.claude/settings.json. 3. 200_000 fallback (current behaviour). The limit is resolved once per _Builder instance, not per update tick, so there is no per-event filesystem cost. No new dependencies (still stdlib only). Default behaviour is unchanged for users without [1m] in settings. Verified live on a real Opus 1M session of ~178K tokens: meter went from 89% (red, false alarm) to 17.9% (cyan, correct).