Initial scaffold: tooling, plan, task briefs

- pnpm 10 workspace + TypeScript strict + ESLint flat + Prettier
- CLAUDE.md as canonical brief
- docs/tasks/ — 22 task briefs broken out by phase for sub-sessions
- docs/decisions/ — ADR scaffold

Implements task 01 (repo-init).

docs/tasks/50-pwa-shell.md

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+# 50 — Manifest, icons, install prompt
+
+## Goal
+
+Make famapp installable as a PWA on iOS and Android.
+
+## Depends on
+
+- 02
+
+## Scope
+
+- `public/manifest.webmanifest` with name, short_name, theme_color, background_color, display: `standalone`, start_url `/`.
+- App icons (192, 384, 512, maskable). Source SVG committed; export script in `scripts/`.
+- `apple-touch-icon` link in root layout.
+- Service worker registration (next-pwa or hand-rolled — prefer hand-rolled to avoid coupling to a library that lags Next.js releases).
+- Install prompt: a small banner on first visit on supported browsers, dismissible.
+
+## Out of scope
+
+- Offline caching (task 51).
+- Background sync.
+
+## Acceptance criteria
+
+- [ ] Lighthouse "Installable" check passes.
+- [ ] Installing on iOS 16.4+ home screen produces a standalone window with no Safari chrome.
+- [ ] App icon shows correctly on Android home screen with maskable variant.