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---
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# vibed-fdph
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title: Escalating daily pixel rewards (triangular per-day)
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status: completed
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type: feature
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priority: normal
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created_at: 2026-07-14T22:38:42Z
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updated_at: 2026-07-14T22:46:49Z
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---
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Reward doing more habits in a single day: the Nth habit checked in a day reveals N units of pixels (1+2+3+... = triangular). Derive revealed pixels from the log per-day triangular sum instead of a flat checks counter; recalibrate pixelsPerCheck so a perfect month still finishes an image. Update DESIGN.md, README.md, ARCHITECTURE.md.
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## Summary of Changes
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Escalating daily reward implemented in `index.html`:
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- Reveal is now **derived from the log** instead of a stored `checks` counter. New helpers `triangular(k)` and `revealedUnits(image)` sum `k·(k+1)/2` units per day (days ≥ startedAt). The Nth habit checked in a day is worth N units, so a 4-check day = 1+2+3+4 = 10 units.
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- `getRevealInfo`: `revealedCount = min(opaque, floor(units · pixelsPerCheck))`.
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- `pixelsPerCheckFor` recalibrated to `max(1, round(opaque / (triangular(habitCount) · 30)))` so a perfect month still fills the image (verified: ~30 days).
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- `onHabitToggle`: snapshots `before` prior to mutating the log; uncheck path no longer touches a counter (past days can't un-reveal). Removed unused `computeFloor`.
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- Dropped vestigial `checks` field from `normalizeImage`/`buildImageFromDef`; legacy saves load fine (field ignored, reveal recomputed).
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- Upload day-estimate updated to use `triangular(habitCount)·ppc` per perfect day.
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- Docs updated: DESIGN.md §3.2 + §9, data model, README.md, ARCHITECTURE.md.
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Validation: no external refs (grep http/https/fetch clean), `node --check` passes, pure-function simulation confirms 3/6/9/12-px escalation and ~30-day perfect-month finish. Not opened in a live browser (none available in this environment).
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## Browser Verification (headless Firefox 152)
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Drove the real app's DOM in headless Firefox with a seeded 4-habit / 4x4-opaque state (pixelsPerCheck=1). Checking habits 1–4 revealed running totals 1, 3, 6, 10 (deltas +1, +2, +3, +4) — escalating exactly as specified, day total = 10. Unchecking the 4th dropped 10→6 (only today's contribution shrank). No console or window errors (`errors: []`).
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