feat(reader): STATUS.md parser + TS project scaffold [skip-tdd: visual for configs]

- vitest+TS scaffold (package.json/tsconfig/vitest.config = config artifacts)
- src/parser.ts: parses STATUS.md blocks → StatusBlock[]
- tests/parser.test.ts: 6 cases (single, multi, blocker, null-blocker, empty, unknown emoji)
- fix emoji contract: align with using-tasks reality (⚪ open / 🔴 in_progress / 🟡 paused / 🔵 blocked / 🟢 done); reader-task acceptance + design doc updated

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/parser.ts

@@ -0,0 +1,77 @@
+export type Status = 'open' | 'in_progress' | 'paused' | 'blocked' | 'done';
+export type StatusEmoji = '⚪' | '🔴' | '🟡' | '🔵' | '🟢';
+
+export interface StatusBlock {
+  slug: string;
+  title: string;
+  status: Status;
+  status_emoji: StatusEmoji;
+  where_stopped: string | null;
+  next_action: string | null;
+  blocker: string | null;
+  branch: string | null;
+}
+
+const EMOJI_TO_STATUS: Record<StatusEmoji, Status> = {
+  '⚪': 'open',
+  '🔴': 'in_progress',
+  '🟡': 'paused',
+  '🔵': 'blocked',
+  '🟢': 'done',
+};
+
+const KNOWN_EMOJIS = Object.keys(EMOJI_TO_STATUS) as StatusEmoji[];
+
+const H2_RE = /^##\s+(\S+)\s+\[([^\]]+)\]\s+—\s+(.+?)\s*$/u;
+const FIELD_RE = /^\*\*([^:*]+):\*\*\s*(.*)$/;
+
+export function parseStatus(text: string): StatusBlock[] {
+  const blocks: StatusBlock[] = [];
+
+  for (const rawBlock of splitBlocks(text)) {
+    const block = parseOneBlock(rawBlock);
+    if (block !== null) blocks.push(block);
+  }
+
+  return blocks;
+}
+
+function splitBlocks(text: string): string[] {
+  return text.split(/^---\s*$/m).map((s) => s.trim()).filter(Boolean);
+}
+
+function parseOneBlock(raw: string): StatusBlock | null {
+  const lines = raw.split(/\r?\n/);
+  let header: { emoji: StatusEmoji; slug: string; title: string } | null = null;
+  const fields: Record<string, string> = {};
+
+  for (const line of lines) {
+    if (header === null) {
+      const m = H2_RE.exec(line);
+      if (m === null) continue;
+      const [, emoji, slug, title] = m;
+      if (emoji === undefined || slug === undefined || title === undefined) continue;
+      if (!KNOWN_EMOJIS.includes(emoji as StatusEmoji)) continue;
+      header = { emoji: emoji as StatusEmoji, slug, title };
+      continue;
+    }
+    const fm = FIELD_RE.exec(line);
+    if (fm !== null) {
+      const [, key, value] = fm;
+      if (key !== undefined && value !== undefined) fields[key.trim()] = value.trim();
+    }
+  }
+
+  if (header === null) return null;
+
+  return {
+    slug: header.slug,
+    title: header.title,
+    status: EMOJI_TO_STATUS[header.emoji],
+    status_emoji: header.emoji,
+    where_stopped: fields['Where I stopped'] ?? null,
+    next_action: fields['Next action'] ?? null,
+    blocker: fields['Blocker'] ?? null,
+    branch: fields['Branch'] ?? null,
+  };
+}