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/12-notes-module.md

@@ -0,0 +1,30 @@
+# 12 — Notes module
+
+## Goal
+
+Lightweight shared notes with optional reminders.
+
+## Depends on
+
+- 04, 07
+
+## Scope
+
+- Schema: `notes` (`id`, `household_id`, `author_id`, `title`, `body` markdown, `pinned` bool, `remind_at` timestamptz nullable, `created_at`, `updated_at`).
+- `/notes` index: pinned first, then by updated_at desc.
+- `/notes/[id]` editor — minimal markdown (use `@uiw/react-md-editor` or similar; live preview optional).
+- `remind_at` writes a row to `reminders` (table comes from `_core`; reminder firing comes from task 41).
+- Manifest: shareable, remindable, searchable (title + body).
+- Dashboard widget: pinned notes.
+
+## Out of scope
+
+- Rich text / WYSIWYG.
+- Attachments (separate later module).
+- Collaborative editing.
+
+## Acceptance criteria
+
+- [ ] Create / edit / pin / delete works.
+- [ ] Setting `remind_at` creates a `reminders` row scoped to entity `notes.note`.
+- [ ] Markdown renders safely (no raw HTML injection).