refactor: split gsd-tools.test.cjs into domain test files

Move 81 tests (18 describe blocks) from single monolithic test file
into 7 domain-specific test files under tests/ with shared helpers.
Test parity verified: 81/81 pass before and after split.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/verify.test.cjs

@@ -0,0 +1,80 @@
+/**
+ * GSD Tools Tests - Verify
+ */
+
+const { test, describe, beforeEach, afterEach } = require('node:test');
+const assert = require('node:assert');
+const fs = require('fs');
+const path = require('path');
+const { runGsdTools, createTempProject, cleanup } = require('./helpers.cjs');
+
+describe('validate consistency command', () => {
+  let tmpDir;
+
+  beforeEach(() => {
+    tmpDir = createTempProject();
+  });
+
+  afterEach(() => {
+    cleanup(tmpDir);
+  });
+
+  test('passes for consistent project', () => {
+    fs.writeFileSync(
+      path.join(tmpDir, '.planning', 'ROADMAP.md'),
+      `# Roadmap\n### Phase 1: A\n### Phase 2: B\n### Phase 3: C\n`
+    );
+    fs.mkdirSync(path.join(tmpDir, '.planning', 'phases', '01-a'), { recursive: true });
+    fs.mkdirSync(path.join(tmpDir, '.planning', 'phases', '02-b'), { recursive: true });
+    fs.mkdirSync(path.join(tmpDir, '.planning', 'phases', '03-c'), { recursive: true });
+
+    const result = runGsdTools('validate consistency', tmpDir);
+    assert.ok(result.success, `Command failed: ${result.error}`);
+
+    const output = JSON.parse(result.output);
+    assert.strictEqual(output.passed, true, 'should pass');
+    assert.strictEqual(output.warning_count, 0, 'no warnings');
+  });
+
+  test('warns about phase on disk but not in roadmap', () => {
+    fs.writeFileSync(
+      path.join(tmpDir, '.planning', 'ROADMAP.md'),
+      `# Roadmap\n### Phase 1: A\n`
+    );
+    fs.mkdirSync(path.join(tmpDir, '.planning', 'phases', '01-a'), { recursive: true });
+    fs.mkdirSync(path.join(tmpDir, '.planning', 'phases', '02-orphan'), { recursive: true });
+
+    const result = runGsdTools('validate consistency', tmpDir);
+    assert.ok(result.success, `Command failed: ${result.error}`);
+
+    const output = JSON.parse(result.output);
+    assert.ok(output.warning_count > 0, 'should have warnings');
+    assert.ok(
+      output.warnings.some(w => w.includes('disk but not in ROADMAP')),
+      'should warn about orphan directory'
+    );
+  });
+
+  test('warns about gaps in phase numbering', () => {
+    fs.writeFileSync(
+      path.join(tmpDir, '.planning', 'ROADMAP.md'),
+      `# Roadmap\n### Phase 1: A\n### Phase 3: C\n`
+    );
+    fs.mkdirSync(path.join(tmpDir, '.planning', 'phases', '01-a'), { recursive: true });
+    fs.mkdirSync(path.join(tmpDir, '.planning', 'phases', '03-c'), { recursive: true });
+
+    const result = runGsdTools('validate consistency', tmpDir);
+    assert.ok(result.success, `Command failed: ${result.error}`);
+
+    const output = JSON.parse(result.output);
+    assert.ok(
+      output.warnings.some(w => w.includes('Gap in phase numbering')),
+      'should warn about gap'
+    );
+  });
+});
+
+// ─────────────────────────────────────────────────────────────────────────────
+// progress command
+// ─────────────────────────────────────────────────────────────────────────────
+