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>

package-lock.json

@@ -7,6 +7,9 @@
     "": {
       "name": "board-viewer",
       "version": "0.1.0",
+      "dependencies": {
+        "smol-toml": "^1.6.1"
+      },
       "devDependencies": {
         "@types/node": "^22.10.0",
         "typescript": "^5.7.0",
@@ -1205,6 +1208,18 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/smol-toml": {
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/smol-toml/-/smol-toml-1.6.1.tgz",
+      "integrity": "sha512-dWUG8F5sIIARXih1DTaQAX4SsiTXhInKf1buxdY9DIg4ZYPZK5nGM1VRIYmEbDbsHt7USo99xSLFu5Q1IqTmsg==",
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/cyyynthia"
+      }
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",