Scaffold CommiTea: yarn workspaces, Electron shell, core label schema, design system

- apps/desktop: electron-vite + React + Tailwind mapped onto design tokens
  (preflight off; tokens/base.css owns the reset); boots to a Reginald
  placeholder proving fonts/tokens/core wiring
- packages/core: pure TS; gitea label schema (est/*, p/*, deadline/hard)
  with pessimistic conflict resolution + 15 unit tests
- docs/design: full design handoff (tokens, 16 component contracts,
  interactive 14-screen prototype, Reginald voice rules)
- docs/PLAN.md: product plan (purity rule, pm-state repo, deterministic
  scheduler + Monte Carlo, directive log)
- Deliberate deviation from novelpad stack: no ElectricSQL/PGlite — local
  store is a rebuildable cache over gitea REST/webhooks (better-sqlite3
  in main process, arriving in P1)

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

docs/design/tokens/spacing.css

@@ -0,0 +1,44 @@
+/* CommiTea spacing, radius, shadow, border & motion tokens. */
+
+:root {
+  /* spacing — 4px base */
+  --space-1: 4px;
+  --space-2: 8px;
+  --space-3: 12px;
+  --space-4: 16px;
+  --space-5: 20px;
+  --space-6: 24px;
+  --space-7: 32px;
+  --space-8: 40px;
+  --space-9: 48px;
+  --space-10: 64px;
+
+  /* radii — crisp, not bubbly */
+  --radius-1: 4px;     /* chips, inputs' inner elements */
+  --radius-2: 6px;     /* buttons, inputs */
+  --radius-3: 10px;    /* cards, dialogs */
+  --radius-round: 999px;
+
+  /* borders */
+  --border-w: 1px;
+  --rule-double: 3px double var(--border-strong);  /* fine-stationery section rule */
+
+  /* shadows — cool, restrained */
+  --shadow-1: 0 1px 2px rgba(20, 34, 28, 0.06);
+  --shadow-2: 0 2px 8px rgba(20, 34, 28, 0.08), 0 1px 2px rgba(20, 34, 28, 0.05);
+  --shadow-3: 0 12px 32px rgba(20, 34, 28, 0.14), 0 2px 8px rgba(20, 34, 28, 0.07);
+  --shadow-jade-line: inset 0 2px 0 var(--jade);   /* jade top rule on key cards */
+
+  /* motion — settled, never bouncy */
+  --ease-out: cubic-bezier(0.25, 0.6, 0.3, 1); /* @kind other */
+  --ease-in-out: cubic-bezier(0.6, 0, 0.3, 1); /* @kind other */
+  --duration-fast: 120ms; /* @kind other */
+  --duration-base: 200ms; /* @kind other */
+  --duration-slow: 320ms; /* @kind other */
+}
+
+[data-theme="dark"] {
+  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.25);
+  --shadow-2: 0 2px 8px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
+  --shadow-3: 0 12px 32px rgba(0, 0, 0, 0.45), 0 2px 8px rgba(0, 0, 0, 0.25);
+}