phase: 97_kb_tree_catalog

All completion criteria verified — everything is green, no defects found. Final report:

## Phase 97 final verification pass — ALL GREEN

**Verified (no code changes needed):**
- `GET /api/docs/tree` (admin), `build_kb_tree` pure builder, `PATCH /api/folders/summary`, migration 0018 (`manually_edited`, head confirmed), generator skip/keep + `kept_manual` stat, RAG tree UI + edit affordance in `sources.js`/`index.html`/`styles.css`
- `tests/e2e/test_kb_tree.py`: 8 passed — top level, drill source/folder, edit round-trip, clear, manual-desc-survives-sync, reload fallback, anonymous gate
- Integration: tree shape/order/403/empty/indexed-only + PATCH update/create/root/clear/404/403/no-LLM + stat-walk equivalence (in `test_docs_api.py`); 3-field `folder_summaries=` import token preserved

**Gates (exact commands):**
- `uv run pytest --cov=app --cov-report=term-missing` → **2053 passed**, TOTAL coverage **99%** (>90% ✓)
- `uv run ruff check . && uv run pyright` → **All checks passed / 0 errors**
- `uv run pytest tests/e2e/test_kb_tree.py -v --no-cov` → **8 passed** in isolation
- 30 story/RAG-view E2E suites run **one per process**: all passed, incl. `test_ls_tree_drilldown` (agent `ls` byte-identical ✓), `test_import_documents`, `test_edit_summaries`, `test_admin_auth`, `test_kb_overview`

**Completion criteria:** tree view ✓ · edit round-trip + clear ✓ · manual persists/clear resets ✓ · `ls` unchanged ✓ · pytest/coverage/lint ✓ · E2E isolation ✓ · commit — left to harness per protocol (working tree untouched, `git add/commit` not run)

**Deviations:** none. **Next pending phase:** none — `todo/` contains only 97 (96 already committed).

tests/e2e/test_retrieval_quality.py

@@ -118,8 +118,15 @@ def test_multi_format_import_hidden_doc_excluded(
     }
 
     # The Sources page (we're already on it, signed in) reflects the set.
+    # Phase 97: the file table is hidden at the top level (the source
+    # row is the tree's top) — drill into the source, where a
+    # `.hidden` junk row WOULD appear, and scope the absence there
+    # (the stat card pins the 13 total: the junk is counted nowhere).
     expect(page.locator("#stat-docs")).to_have_text("13")
+    page.locator("#folders-tbody .folder-link").first.wait_for(state="visible")
+    page.click('#folders-tbody a.folder-link:text-is("docs")')
     expect(page.locator("#docs-tbody tr", has_text=".hidden")).to_have_count(0)
+    expect(page.locator("#folders-tbody .folder-link", has_text=".hidden")).to_have_count(0)
 
 
 def test_gitlab_question_is_grounded_with_gitlab_chip(