feat: Scan Ledger — versioned scan history + trajectory UI#25

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redesign/bright-inspectorfrom

feat/scan-ledger

Commits on Jun 16, 2026

docs: Scan Ledger design spec + blueprint
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docs: Scan Ledger implementation plan
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docs: fix Scan Ledger plan — realistic toSnapshot fixture + sparkline null guard
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feat(ledger): pure snapshots module (toSnapshot/appendSnapshot/snapshotTrend/sparkline)
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feat(ledger): add 'snapshots' object store (idb v3->v4, additive)
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feat(ledger): record + read snapshots in store.js, seed prior scan on saveRepo
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feat(ledger): round-trip snapshots through the backup envelope (v2)
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feat(ledger): health sparkline on library cards
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feat(ledger): History strip on the Verdict tab
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fix(ledger): back up decisions, clamp imported snaps to 30, isolate ledger tests
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