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`

frontend/assets/sources.js

@@ -627,7 +627,11 @@ function wireDescriptionEdit({
  * hatch, set for real description text whenever non-empty — the marker
  * keeps its OWN D4 title, the empty cell carries none). The editor's
  * open/close swaps happen INSIDE the wrapper (the container is the
- * wrapper — the <td> always keeps it). */
+ * wrapper — the <td> always keeps it).
+ * Phase 156 (task 02, A3): the Edit button's visible text is the
+ * .cell-clip span — a squeezed cell shows "…" instead of a hard cut;
+ * the aria-label names the row (the source / the source/folder path
+ * — the phase-97 idiom), so the full text stays reachable. */
 function makeDescCell(node, source, folder, label) {
   const td = document.createElement("td");
   /* Phase 99 (task 01, D1): the ONE flex wrapper — the text flexes +
@@ -651,7 +655,15 @@ function makeDescCell(node, source, folder, label) {
   const btn = document.createElement("button");
   btn.type = "button";
   btn.className = "kb-summary-edit";
-  btn.textContent = "Edit";
+  /* 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 below names the row (the source / the
+     source/folder path — the phase-97 idiom), so the full text
+     stays reachable. */
+  const clip = document.createElement("span");
+  clip.className = "cell-clip";
+  clip.textContent = "Edit"; // never innerHTML (XSS contract)
+  btn.append(clip);
   btn.setAttribute("aria-label", `Edit description: ${label}`);
   wrap.append(text, btn);
   td.append(wrap);