fix(sdk): register init.ingest-docs handler and add registry drift guard (#2442)

The ingest-docs workflow called `gsd-sdk query init.ingest-docs` with a
fallback to `init.default` — neither was registered in createRegistry(),
so the workflow proceeded with `{}` and tried to parse project_exists,
planning_exists, has_git, and project_path from empty.

- Add initIngestDocs handler; register dotted + space aliases
- Simplify workflow call; drop broken fallback
- Repo-wide drift guard scans commands/, agents/, get-shit-done/,
  hooks/, bin/, scripts/, docs/ for `gsd-sdk query <cmd>` and fails
  on any reference with no registered handler (file:line citations)
- Unit tests for the new handler

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

sdk/src/query/init.ts

@@ -950,6 +950,26 @@ export const initRemoveWorkspace: QueryHandler = async (args, _projectDir) => {
   return { data: result };
 };
 
+// ─── initIngestDocs ───────────────────────────────────────────────────────
+
+/**
+ * Init handler for ingest-docs workflow.
+ * Mirrors `initResume` shape but without current-agent-id lookup — the
+ * ingest-docs workflow reads `project_exists`, `planning_exists`, `has_git`,
+ * and `project_path` to branch between new-project vs merge-milestone modes.
+ */
+export const initIngestDocs: QueryHandler = async (_args, projectDir) => {
+  const config = await loadConfig(projectDir);
+  const result: Record<string, unknown> = {
+    project_exists: pathExists(projectDir, '.planning/PROJECT.md'),
+    planning_exists: pathExists(projectDir, '.planning'),
+    has_git: pathExists(projectDir, '.git'),
+    project_path: '.planning/PROJECT.md',
+    commit_docs: config.commit_docs,
+  };
+  return { data: withProjectRoot(projectDir, result, config as Record<string, unknown>) };
+};
+
 // ─── docsInit ────────────────────────────────────────────────────────────
 
 export const docsInit: QueryHandler = async (_args, projectDir) => {