Snapshot WIP: solver HP epic progress, BPHX/HX physics, BMAD skill refresh.

Capture uncommitted solver robustness work (regularization, domain errors, linear solver lifecycle, tube DP/MSH), web workbench updates, and synced BMAD skills across IDE agent folders before starting BPHX pressure-drop.

Co-authored-by: Cursor <cursoragent@cursor.com>

.cline/skills/bmad-ux/assets/experience-example-mobile.md

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+---
+name: Quill
+status: final
+sources:
+  - {planning_artifacts}/prds/quill-2025-08-15/prd.md
+updated: 2025-09-02
+---
+
+# Quill — Experience Spine
+
+> Illustrative example. Single-surface mobile (iOS + Android parity). Consumer posture, calm by default. Paired with `design-example-mobile.md` (Quill DESIGN.md). Demonstrates: microcopy as gating discipline, Inspiration & Anti-patterns earning its place, Responsive & Platform omitted (single-surface).
+
+## Foundation
+
+Single-surface mobile, iOS + Android with parity. No UI system named — inherits platform conventions for navigation, system gestures, dynamic type. `DESIGN.md` is the visual identity reference; this spine is the experience. Dark mode is the default surface; light is a setting.
+
+## Information Architecture
+
+| Surface | Reached from | Purpose |
+|---|---|---|
+| Today | App open (cold) | Today's prompt + entry composer |
+| Library | Tab bar | Past entries, searchable |
+| Entry detail | Library row tap | Read / edit one entry |
+| Settings | Today header gear | Account, export, theme |
+
+Bottom tab bar (Today / Library / Settings). No drawer. Modal stacks one level deep, never two.
+
+→ Composition reference: `mockups/today-cold.html`, `mockups/composer.html`. Spine wins on conflict.
+
+## Voice and Tone
+
+Microcopy. Brand voice and aesthetic posture live in `DESIGN.md`.
+
+| Do | Don't |
+|---|---|
+| "Today's prompt." | "Time to write!" |
+| "Saved." | "✓ Auto-saved successfully" |
+| "We couldn't reach the cloud — your work is on this device." | "Network error" |
+| Short, complete sentences. | Streak counters, encouragement, exclamation marks. |
+
+## Component Patterns
+
+Behavioral. Visual specs live in `DESIGN.md.Components`.
+
+| Component | Use | Behavioral rules |
+|---|---|---|
+| Prompt card | Today | One per day. Tap opens composer. |
+| Composer | Today + entry detail | No formatting toolbar in v1. Autosave on pause ≥ 600ms. |
+| Entry row | Library list | Tap → entry detail. Long-press reserved for system text selection. |
+| Save indicator | Composer header | Cycles `Editing…` → `Saved.` (≥ 800ms visible). |
+| Settings row | Settings list | Tap → detail or toggle. |
+
+## State Patterns
+
+| State | Surface | Treatment |
+|---|---|---|
+| Cold open | Today | Show today's prompt (cached). If no cache, `Today's prompt is loading.` with skeleton. |
+| Empty library | Library | `No entries yet — Today's prompt is your first.` Link to Today. |
+| Search empty | Library search | `No matches.` No suggestions. |
+| Offline write | Composer | Save locally. No banner. Sync on next foreground. |
+| Sync error | Settings → Account | Surfaced here only. Never block writing. |
+| Focus | Composer | Native cursor + keyboard. No custom focus chrome. |
+
+## Interaction Primitives
+
+- Tap to act. Long-press reserved for system text selection.
+- Swipe-to-delete on entry rows (native pattern, confirm sheet).
+- Pull-to-refresh on Library only.
+- **Banned:** carousels, hero animations on open, badge counts, streaks, push-notification re-engagement.
+
+## Accessibility Floor
+
+Behavioral. Visual contrast lives in `DESIGN.md`.
+
+- VoiceOver / TalkBack: every interactive element labeled with role + state. Save indicator announces `Saved` on transition.
+- Dynamic type honored through `DESIGN.md` typography tokens. UI must remain legible at largest setting — no truncated controls.
+- Reduce Motion: skip the save-indicator fade; show `Saved.` immediately.
+- Tap targets ≥ 44pt (iOS) / 48dp (Android).
+- Focus traversal follows reading order on every surface.
+
+## Inspiration & Anti-patterns
+
+- **Lifted from Day One:** the single daily entry framing — one prompt, one composer, no inbox.
+- **Lifted from iA Writer:** the no-toolbar composer; formatting is a settings-level decision, not a per-entry one.
+- **Rejected — Streaks (Duolingo, most habit apps):** streaks weaponize the user's calendar. Quill's value is showing up *today*, not punishing missed days.
+- **Rejected — AI prompt suggestions inside the composer:** the composer is for writing, not negotiating with a model. AI lives only in the daily prompt generation.
+
+## Key Flows
+
+### Flow 1 — Daily write (Mira, late evening, after work)
+
+1. Mira opens app.
+2. Today surface shows today's prompt (cached if offline).
+3. She taps the composer entry point.
+4. Composer opens, keyboard active.
+5. She writes; autosave fires on pause.
+6. She taps Back.
+7. **Climax:** Today surface shows `Saved.` and the entry's first line below the prompt — proof the day is captured.
+
+Failure: cold prompt fetch fails → composer still opens with cached generic prompt; banner on Today only after Mira returns.
+
+### Flow 2 — Recall past entry (Mira, three weeks later, looking for what she wrote about her mother)
+
+1. Mira taps Library.
+2. Scrolls or searches.
+3. Taps entry row.
+4. Entry detail opens in read mode.
+5. She taps anywhere to enter edit mode (cursor at tap point).
+6. Edits autosave.
+7. **Climax:** `Saved.` visible in entry header — the older self and the present self are in continuous conversation.
+
+Empty state: no entries → message routes back to Today.