chore(bit-by-bit): record escalating daily pixel reward tickets

Beans records for the triangular per-day reveal work (Nth habit check
of the day reveals N units): vibed-fdph (completed, with the shipped
implementation summary) and a duplicate vibed-i315 opened in the same
session. Retained for the historical task record.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.beans/vibed-fdph--escalating-daily-pixel-rewards-triangular-per-day.md

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+---
+# vibed-fdph
+title: Escalating daily pixel rewards (triangular per-day)
+status: completed
+type: feature
+priority: normal
+created_at: 2026-07-14T22:38:42Z
+updated_at: 2026-07-14T22:46:49Z
+---
+
+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.
+
+## Summary of Changes
+
+Escalating daily reward implemented in `index.html`:
+
+- 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.
+- `getRevealInfo`: `revealedCount = min(opaque, floor(units · pixelsPerCheck))`.
+- `pixelsPerCheckFor` recalibrated to `max(1, round(opaque / (triangular(habitCount) · 30)))` so a perfect month still fills the image (verified: ~30 days).
+- `onHabitToggle`: snapshots `before` prior to mutating the log; uncheck path no longer touches a counter (past days can't un-reveal). Removed unused `computeFloor`.
+- Dropped vestigial `checks` field from `normalizeImage`/`buildImageFromDef`; legacy saves load fine (field ignored, reveal recomputed).
+- Upload day-estimate updated to use `triangular(habitCount)·ppc` per perfect day.
+- Docs updated: DESIGN.md §3.2 + §9, data model, README.md, ARCHITECTURE.md.
+
+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).
+
+## Browser Verification (headless Firefox 152)
+
+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: []`).

.beans/vibed-i315--escalating-daily-pixel-rewards-triangular-per-day.md

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+---
+# vibed-i315
+title: Escalating daily pixel rewards (triangular per-day)
+status: in-progress
+type: feature
+created_at: 2026-07-14T22:38:38Z
+updated_at: 2026-07-14T22:38:38Z
+---
+
+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.