Add initial Go CLI skeleton

internal/db/schema/002_orch.sql

@@ -0,0 +1,52 @@
+CREATE TABLE IF NOT EXISTS runs (
+  run_id TEXT PRIMARY KEY,
+  goal TEXT NOT NULL,
+  summary TEXT NOT NULL DEFAULT '',
+  status TEXT NOT NULL DEFAULT 'active',
+  created_at TEXT NOT NULL,
+  updated_at TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS tasks (
+  run_id TEXT NOT NULL,
+  task_id TEXT NOT NULL,
+  title TEXT NOT NULL,
+  summary TEXT NOT NULL DEFAULT '',
+  status TEXT NOT NULL,
+  default_to TEXT,
+  priority TEXT NOT NULL DEFAULT 'normal',
+  acceptance_json TEXT NOT NULL DEFAULT '[]',
+  latest_attempt_no INTEGER,
+  created_at TEXT NOT NULL,
+  updated_at TEXT NOT NULL,
+  PRIMARY KEY (run_id, task_id),
+  FOREIGN KEY(run_id) REFERENCES runs(run_id)
+);
+
+CREATE TABLE IF NOT EXISTS task_dependencies (
+  run_id TEXT NOT NULL,
+  task_id TEXT NOT NULL,
+  depends_on_task_id TEXT NOT NULL,
+  PRIMARY KEY (run_id, task_id, depends_on_task_id)
+);
+
+CREATE TABLE IF NOT EXISTS task_attempts (
+  run_id TEXT NOT NULL,
+  task_id TEXT NOT NULL,
+  attempt_no INTEGER NOT NULL,
+  assigned_to TEXT NOT NULL,
+  thread_id TEXT NOT NULL,
+  base_ref TEXT,
+  base_commit TEXT,
+  branch_name TEXT,
+  worktree_path TEXT,
+  workspace_status TEXT,
+  result_commit TEXT,
+  status TEXT NOT NULL,
+  created_at TEXT NOT NULL,
+  updated_at TEXT NOT NULL,
+  PRIMARY KEY (run_id, task_id, attempt_no)
+);
+
+CREATE INDEX IF NOT EXISTS idx_tasks_run_status
+  ON tasks(run_id, status, priority, updated_at);