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Life Chronicle Phase A.4 (E1, ambient temporality). Rather than a separate RRF arm (which needs chunk hydration + risks the fusion path), E1 is a bounded post-fusion boost: applyChronicleTypeBoost lifts `event`/`diary` results on temporal queries, wired INSIDE runPostFusionStages' `recency !== 'off'` branch so it fires ONLY on temporal intent — non-temporal search is bit-for-bit unchanged (proven by 110 passing search-path tests). Bounded ([1.0,1.25]) + floor-gated like the other metadata stages; attribution via `chronicle_boost`. 3 unit tests. (Empirical precision/negative measurement lands with the eval.) Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>