phase: 156_table_ux_polish

Everything is verified. All gates green on the current working tree. Final report:

**Phase 156 — final verification pass (all 4 task files present in `complete/` — no outstanding work)**

- **Verified (not re-implemented):** bounded-panel `.table-wrap` (`max-height: min(70vh, 64rem)`, `overflow: auto`, opaque sticky `th` via `var(--brand-soft)`), `.cell-clip` ellipsis rule + the five label families in the three renderers, the added aria-labels, unit pins (incl. `.md-table-wrap` byte-unchanged scope guard, `#git-sources-table-wrap` harmony — no divergent rule), dedicated E2E suite (sticky ×3 tables, horizontal contract, computed-style ellipsis + reachable full text, mobile hamburger + scroll + pin)
- **Tests/lint/coverage:** `uv run pytest --cov=app --cov-report=term-missing` → **3570 passed, 99% on `app/`** (gate >90%); `uv run pytest tests/e2e/test_table_ux_polish.py -v --no-cov` (DB up) → **6/6 passed in isolation**; `uv run ruff check . && uv run pyright` → **clean** (0 errors)
- **Completion criteria:** sticky header all 3 tables (exact-0 offset while `scrollTop > 0`) ✅ · horizontal scroll unchanged ✅ · ellipsis computed style + actual clip + title/aria reachable ✅ · mobile ≤640px contract ✅ · full suite/E2E/lint/coverage ✅ · atomic commit: **harness commits this phase after the pass** (per pipeline protocol — no git history commands run by me)
- **Documentation:** AGENTS.md phase-156 wording (bounded panels, sticky headers, `.cell-clip` + aria-label idiom) matches the implementation exactly — verified consistent; README.md reviewed in full (pages/URLs vs registered routes, all `.env.example` vars documented, Quick Start, eval/llm scripts, compose prod profile, E2E examples) — verified consistent, no changes needed (README describes no table layout/scroll, so no phase-156 mention required)
- **Deviations:** none — all work was already in the working tree; this pass re-verified every gate and the docs
- **Next pending phase:** `157_chat_chip_cap`

tests/unit/test_kb_tree_ui.py

@@ -811,7 +811,15 @@ def test_row_description_cell_builds_text_and_always_present_edit() -> None:
     )
     assert 'btn.type = "button"' in body
     assert 'btn.className = "kb-summary-edit"' in body
-    assert 'btn.textContent = "Edit"' in body
+    # Phase 156 (task 02, A3): the visible text is the .cell-clip
+    # span (a squeezed Description cell shows "…" instead of a hard
+    # cut) — the aria-label names the row, so the full text stays
+    # reachable.
+    assert 'clip.className = "cell-clip"' in body, (
+        "the clip label span (phase 156, A3)"
+    )
+    assert 'clip.textContent = "Edit"' in body, "the visible text (never innerHTML)"
+    assert "btn.append(clip)" in body, "the span is the button's label"
     assert 'btn.setAttribute("aria-label", `Edit description: ${label}`)' in body
     assert 'wrap.className = "kb-desc-cell"' in body, "the ONE flex wrapper"
     assert "wrap.append(text, btn)" in body, "text + button, in order, in the wrapper"