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/base.css

@@ -0,0 +1,37 @@
+/* CommiTea base element styles. */
+
+* { box-sizing: border-box; }
+
+body {
+  margin: 0;
+  font: var(--text-body);
+  color: var(--text-body);
+  background: var(--surface-app);
+  -webkit-font-smoothing: antialiased;
+  text-rendering: optimizeLegibility;
+}
+
+a {
+  color: var(--accent-text);
+  text-decoration: none;
+  border-bottom: 1px solid var(--line-2);
+  transition: border-color var(--duration-fast) var(--ease-out);
+}
+a:hover {
+  color: var(--accent-hover);
+  border-bottom-color: var(--jade);
+}
+
+::selection {
+  background: var(--spruce-2);
+  color: var(--ink-1);
+}
+
+code, kbd {
+  font: var(--text-data);
+}
+
+:focus-visible {
+  outline: 2px solid var(--focus-ring);
+  outline-offset: 2px;
+}