feat(wave3): add @mosaic/coord — TypeScript orchestrator package

- Mission CRUD: createMission, loadMission
- TASKS.md parser/writer: parseTasksFile, writeTasksFile, updateTaskStatus
- Task runner: runTask, resumeTask (spawns agent via child_process)
- Status aggregation: getMissionStatus, getTaskStatus
- CLI: coord init | run | resume | status
- Depends on @mosaic/types and @mosaic/queue workspace:*

packages/coord/tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": { "outDir": "dist", "rootDir": "src" },
+  "include": ["src"]
+}