feat(reader): Gitea client + config + board orchestrator

closes board-viewer-gitea-reader

- src/gitea.ts: HTTP client (getFile, getLatestCommitIso, rawUrl); DI'd fetch
- src/reader.ts: readBoard(client, repos) → TaskRecord[]
- src/config.ts: TOML config loader with board_viewer_repos whitelist
- 25 tests total (9 parser incl. 3 real-repo fixtures, 7 gitea, 5 reader, 4 config)
- emoji contract ⚪🔴🟡🔵🟢 (open/in_progress/paused/blocked/done)

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

src/reader.ts

@@ -0,0 +1,56 @@
+import type { GiteaClient } from './gitea.ts';
+import { parseStatus, type Status, type StatusEmoji } from './parser.ts';
+
+export interface RepoRef {
+  owner: string;
+  repo: string;
+}
+
+export interface TaskRecord {
+  slug: string;
+  project: string;
+  project_owner: string;
+  status: Status;
+  status_emoji: StatusEmoji;
+  title: string;
+  where_stopped: string | null;
+  next_action: string | null;
+  blocker: string | null;
+  branch: string | null;
+  last_commit_iso: string | null;
+  raw_url: string;
+}
+
+export async function readBoard(
+  client: GiteaClient,
+  repos: ReadonlyArray<RepoRef>,
+): Promise<TaskRecord[]> {
+  const records: TaskRecord[] = [];
+
+  for (const { owner, repo } of repos) {
+    const status = await client.getFile(owner, repo, '.tasks/STATUS.md');
+    if (status === null) continue;
+
+    const blocks = parseStatus(status);
+    for (const block of blocks) {
+      const taskPath = `.tasks/${block.slug}.md`;
+      const last_commit_iso = await client.getLatestCommitIso(owner, repo, taskPath);
+      records.push({
+        slug: block.slug,
+        project: repo,
+        project_owner: owner,
+        status: block.status,
+        status_emoji: block.status_emoji,
+        title: block.title,
+        where_stopped: block.where_stopped,
+        next_action: block.next_action,
+        blocker: block.blocker,
+        branch: block.branch,
+        last_commit_iso,
+        raw_url: client.rawUrl(owner, repo, taskPath),
+      });
+    }
+  }
+
+  return records;
+}