fix: align new-project map gate and guard onboarding summary overwrite

init new-project now uses the same seven-file codebase map completeness
check as init onboard, so partial .planning/codebase/ directories no longer
skip the brownfield mapping offer after onboarding warns about an incomplete
map.

The onboard workflow now branches on onboarding_summary_exists and asks for
confirmation before regenerating SUMMARY.md on repeat runs.

gsd-core/workflows/onboard.md

@@ -177,6 +177,33 @@ true, continue.
 Create `.planning/onboarding/SUMMARY.md` only after PROJECT.md exists. If it already
 exists, update it only after confirmation; do not overwrite silently.
 
+If `onboarding_summary_exists` is true:
+
+- If `TEXT_MODE=true`, print:
+
+```text
+Onboarding summary already exists at .planning/onboarding/SUMMARY.md.
+
+1. Update summary — regenerate from current artifact status (Recommended)
+2. Keep existing summary — skip writing
+
+Enter number:
+```
+
+Stop and wait for the user's reply.
+
+- Otherwise use AskUserQuestion:
+  - header: "Onboarding Summary"
+  - question: "Onboarding summary already exists. Update it from current artifact status?"
+  - options:
+    - "Update summary" — Regenerate `.planning/onboarding/SUMMARY.md` (Recommended)
+    - "Keep existing summary" — Skip writing
+
+If the user chooses to keep the existing summary, skip to Step 7 without writing.
+
+If `onboarding_summary_exists` is false or the user confirms an update, write the summary
+using the template below.
+
 Summary contents:
 
 ```markdown

src/init.cts

@@ -747,6 +747,9 @@ function cmdInitNewProject(cwd: string, raw: boolean): void {
 
   const hasCode = hasCodeFilesInternal(cwd);
   const hasPackageFile = hasPackageFileInternal(cwd);
+  const isBrownfield = hasCode || hasPackageFile;
+  const codebaseMapFiles = listCodebaseMapFiles(cwd);
+  const hasCodebaseMap = codebaseMapFiles.length === REQUIRED_CODEBASE_MAP_FILES.length;
 
   const result: Record<string, unknown> = {
     researcher_model: resolveModelInternal(cwd, 'gsd-project-researcher'),
@@ -756,14 +759,13 @@ function cmdInitNewProject(cwd: string, raw: boolean): void {
     commit_docs: config.commit_docs,
 
     project_exists: pathExistsInternal(cwd, '.planning/PROJECT.md'),
-    has_codebase_map: pathExistsInternal(cwd, '.planning/codebase'),
+    has_codebase_map: hasCodebaseMap,
     planning_exists: pathExistsInternal(cwd, '.planning'),
 
     has_existing_code: hasCode,
     has_package_file: hasPackageFile,
-    is_brownfield: hasCode || hasPackageFile,
-    needs_codebase_map:
-      (hasCode || hasPackageFile) && !pathExistsInternal(cwd, '.planning/codebase'),
+    is_brownfield: isBrownfield,
+    needs_codebase_map: isBrownfield && !hasCodebaseMap,
 
     ...getInitGitState(cwd),
 

tests/init.test.cjs

@@ -1599,6 +1599,9 @@ describe('cmdInitNewProject', () => {
   test('brownfield with codebase map does not need map', () => {
     fs.writeFileSync(path.join(tmpDir, 'package.json'), '{"name":"test"}');
     fs.mkdirSync(path.join(tmpDir, '.planning', 'codebase'), { recursive: true });
+    for (const name of ['STACK', 'ARCHITECTURE', 'STRUCTURE', 'CONVENTIONS', 'TESTING', 'INTEGRATIONS', 'CONCERNS']) {
+      fs.writeFileSync(path.join(tmpDir, '.planning', 'codebase', `${name}.md`), `# ${name}\n`);
+    }
 
     const result = runGsdTools('init new-project', tmpDir);
     assert.ok(result.success, `Command failed: ${result.error}`);