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_nav_consistency.py

@@ -608,15 +608,16 @@ def test_viewer_nav_click_full_loads_the_shell_rag_view(
 
     # The arrival is the SHELL at the RAG view's URL: the document loaded
     # for real (the sentinel is gone), the RAG view is rendered (first
-    # table row visible), the Chat view is hidden AND inert in the same
-    # document, and the RAG link carries the router's single-writer
-    # active stamp.
+    # catalog row visible — phase 97: the top level lists the sources;
+    # the file table is per-level and hidden at the top), the Chat view
+    # is hidden AND inert in the same document, and the RAG link carries
+    # the router's single-writer active stamp.
     expect(page).to_have_url(app_url + SOURCES_URL, timeout=30_000)
     assert page.evaluate("() => window.__phase76_viewer") is None, (
         "a surviving document's nav click must be a real departure "
         "(a fresh document load wipes window globals)"
     )
-    expect(page.locator("#docs-tbody tr").first).to_be_visible(timeout=15_000)
+    expect(page.locator("#folders-tbody tr").first).to_be_visible(timeout=15_000)
     expect(page.locator("#view-chat")).to_be_hidden()
     assert page.evaluate("() => document.getElementById('view-chat').inert") is True, (
         "the chat view ships hidden AND inert in the shell"