refactor(query): deepen command/dispatch seams and resolve coderabbit findings

* refactor(query): deepen command definition seam and fold fallback mapping cleanup

* refactor(query): add shared dispatch formatting module seam

* fix(query): restore QueryResult type import in dispatch deps

* test/query: align raw-output policy and definition normalization contracts

* refactor(query): deepen diagnosis, invariant report, and error taxonomy seams

* refactor(query): deepen dispatch plan, fallback bridge, policy snapshot, and hints seams

* refactor(query): deepen validation, fallback policy, capability, and result builder seams

* refactor(query): deepen resolution strategy, output classifier, observability, and policy-capability seams

* refactor(query): finalize deep strategy/classifier/observability/capability seams

* test/query: address coderabbit inline and out-of-diff dispatch nits

* fix(query): address remaining coderabbit input-validation and bridge stderr threads

* fix(query): address remaining coderabbit dispatch and strategy/output nits

sdk/src/query/query-fallback-policy.test.ts

@@ -0,0 +1,13 @@
+import { describe, it, expect } from 'vitest';
+import { canUseCjsFallback, describeFallbackDisabledPolicy } from './query-fallback-policy.js';
+
+describe('query-fallback-policy', () => {
+  it('describes disabled fallback policy', () => {
+    expect(describeFallbackDisabledPolicy()).toContain('GSD_QUERY_FALLBACK=registered');
+  });
+
+  it('reports fallback capability', () => {
+    expect(canUseCjsFallback({ cjsFallbackEnabled: true })).toBe(true);
+    expect(canUseCjsFallback({ cjsFallbackEnabled: false })).toBe(false);
+  });
+});