docs: PR review fixes for api-reference, CONTRIBUTING, and markdown tests

Author: clean6378-max-it

CONTRIBUTING.md

@@ -50,7 +50,7 @@ Useful flags:
 pytest -q                              # full suite + coverage (see pyproject.toml)
 pytest tests/test_api_integration.py -v
 pytest tests/test_search.py -v
-pytest tests/test_api_routes.py -v     # when present on branch
+pytest tests/test_api_routes.py -v
 pytest tests/test_error_codes.py -v
 ```
 

docs/api-reference.md

@@ -31,6 +31,8 @@ Most `/api/*` error responses use this shape:
 |----------|--------|------|
 | `GET /api/projects/<project_name>/sessions` | 400 | `[]` (empty JSON array) when `project_name` fails path validation |
 
+*Legacy response shape — not the long-term contract. New clients should not treat bare `[]` as the intended error format; migration to structured `{error, code}` with `INVALID_PATH` is planned.*
+
 All other documented error paths below use the structured envelope.
 
 Extra fields may appear for specific codes (for example `since` on invalid bulk-export mode).
@@ -172,7 +174,7 @@ Lists sessions in one project with summary fields for the workspace sidebar. Ski
 
 | Status | `code` | When |
 |--------|--------|------|
-| 400 | — | Invalid `project_name` (path escape). **Body is `[]`**, not a structured error — documented behavior |
+| 400 | — | Invalid `project_name` (path escape). **Body is `[]`** (legacy — see [Error envelope](#error-envelope) exception); not a structured error |
 
 ```bash
 curl -s "http://127.0.0.1:5000/api/projects/F--boost-capy/sessions" | jq '.[0]'
@@ -316,7 +318,7 @@ Read-only snapshot of bulk-export state persisted under `~/.claude-code-chat-bro
 |-------|------|-------------|
 | `last_export_time` | string \| null | ISO timestamp of last completed bulk export |
 | `last_export_session_count` | integer | Sessions in last bulk export run |
-| `export_count` | integer | Same as `last_export_session_count` (alias for UI) |
+| `export_count` | integer | **Legacy alias** — same value as `last_export_session_count`; prefer `last_export_session_count` in new integrations (kept for SPA backwards compatibility) |
 
 ```json
 {

static/js/shared/markdown.test.js

@@ -1,4 +1,4 @@
-import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
 import DOMPurify from 'dompurify';
 import { marked } from 'marked';
 import { cleanContent, renderMarkdown } from './markdown.js';
@@ -29,14 +29,20 @@ describe('renderMarkdown', () => {
     });
 
     it('sanitizes script tags from parsed output', () => {
+        const sanitizeSpy = vi.spyOn(DOMPurify, 'sanitize');
         const html = renderMarkdown('# Hello\n\n<script>alert(1)</script>');
+        expect(sanitizeSpy).toHaveBeenCalled();
         expect(html).not.toContain('<script');
         expect(html).not.toMatch(/alert\s*\(/);
+        sanitizeSpy.mockRestore();
     });
 
     it('strips event handlers from parsed output', () => {
+        const sanitizeSpy = vi.spyOn(DOMPurify, 'sanitize');
         const html = renderMarkdown('<img src=x onerror=alert(1)>');
+        expect(sanitizeSpy).toHaveBeenCalled();
         expect(html).not.toMatch(/onerror/i);
+        sanitizeSpy.mockRestore();
     });
 
     it('falls back to inline code when marked is unavailable', () => {