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/21-quick-add.md

@@ -0,0 +1,26 @@
+# 21 — Quick-add registry
+
+## Goal
+
+A single global `+` button on the dashboard (and a `cmd+k` palette anywhere) that lists actions contributed by modules.
+
+## Depends on
+
+- 20
+
+## Scope
+
+- `QuickAddAction` type: `{ id, label, icon?, shortcut?, run: () => void | Promise<void> }`.
+- Modules register via manifest. Registry exposes a sorted list.
+- UI: floating `+` on dashboard opens a sheet of actions; `cmd/ctrl+k` opens a command-palette-style modal (use `cmdk` package).
+- Default actions: New event, Add to shopping, Add to tasks, New note.
+
+## Out of scope
+
+- Fuzzy search across data (search adapter is a later concern).
+- Action history / recents.
+
+## Acceptance criteria
+
+- [ ] Adding a new module that registers a quick-add appears in both the FAB sheet and the cmd-k palette without touching core.
+- [ ] Keyboard navigation works in the palette (arrows + enter + escape).