Add token metrics across sessions, analytics, and UI#232

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wesm merged 12 commits intowesm:mainfrom

tpn:tpn/229-token-metrics-pr

Apr 1, 2026

Commits on Mar 31, 2026

feat: persist token coverage metadata

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fix: preserve token metadata in orphan copy, fix empty heatmap

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Commits on Apr 1, 2026

feat(parser): extract InferTokenPresence as canonical shared function

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refactor: delegate Message.TokenPresence to parser.InferTokenPresence
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refactor: delegate PG inferTokenCoverage to parser.InferTokenPresence
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refactor: extract ComputeSessionCoverageUpdates

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refactor: split SQLite session backfill into focused functions

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refactor: split PG session backfill, use shared coverage computation

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refactor: remove lazy SessionMessageTokenCoverage from incremental path

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refactor: remove unused SessionMessageTokenCoverage

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Remove spec document
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fix(e2e): use exact match for Sessions card label

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