phase: 113_source_chip_quality

All gates green — no defects found; this pass was verification only.

**Phase 113 final verification pass — report**

- Verified (no code changes needed): `select_documents_tiered` cited/related tiering + `select_documents` wrapper, `TurnPlan.related_docs`, `ChatDoneEvent.related` (additive, old payloads parse), `appendRelated` UI row (`.related-doc`, never `.source-chip`), done-frame + restore-path wiring, two settings with validators, `.env.example` entries
- `uv run pytest --cov=app --cov-report=term-missing` → 2422 passed, app/ coverage **99%** (>90% gate)
- `uv run pytest tests/e2e/test_source_chip_quality.py -v --no-cov` (isolated) → 2 passed
- Regression E2E `test_retrieval_quality.py` + `test_honest_deflection.py` + `test_chat_rag.py` + `test_sources_midstream_bug.py` → 17 passed
- `uv run ruff check . && uv run pyright` → clean (0 errors); `bash .agents/validate.sh` → "validation OK"

Completion criteria:
1. Single-doc question → exactly one `.source-chip` (E2E): ✅ passed
2. Weak 2nd doc only in de-emphasized related row, never `.source-chip` (unit + E2E): ✅ passed
3. Deflected turn → zero citation chips, weak hits in related row: ✅ passed
4. Full suite green, coverage >90%, isolated E2E green, lint/types clean: ✅ passed
5. `--no-gpg-sign` commit + phase dir move: left to harness per pass rules (task files already in `complete/`)

No deviations. Next pending phase: `114_embed_question_length`.

frontend/assets/styles.css

@@ -692,6 +692,51 @@ details.thinking .thinking-text ul { margin: 0 0 0.5rem; }
 }
 .source-chip:hover { background: var(--brand-soft); text-decoration: underline; }
 
+/* Phase 113 (task 02): the related-docs row — the SECONDARY tier of
+   scored docs (phase 113 task 01's usefulness bar demotes the
+   sub-floor hits out of the citation surface; on a deflected turn the
+   weak hits live HERE and the chip row is absent). It must never read
+   as a citation: smaller mono links, DASHED border (the solid brand
+   pill is the citation look), transparent fill, muted --ink-soft text
+   — 8.6:1 on --bg (verified ≥4.5:1, WCAG 2.1 AA), palette variables
+   only (phase-92 zero-literal: no new hue, the monochrome theme grays
+   it automatically). The row joins .msg-meta (the .msg-body flex gap
+   stacks it below the citation row — no extra margin) but the meta
+   ACTIONS never do: app.js appends it last, after the first-row
+   claimers. :focus-visible via the global 3px outline rule. The hover
+   is deliberately flat — NO background swap (the chip's brand-soft
+   hover is the citation affordance): only the ink-soft → ink step-up
+   plus the underline. */
+.related-docs-label {
+  font-size: 0.68rem;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  color: var(--ink-soft);
+}
+.related-doc {
+  display: inline-flex;
+  align-items: center;
+  font-family: var(--mono);
+  font-size: 0.7rem;
+  color: var(--ink-soft);
+  background: transparent;
+  border: 1px dashed var(--line);
+  border-radius: 999px;
+  padding: 0.12rem 0.55rem;
+  text-decoration: none;
+  max-width: 100%;
+  /* min-width: 0 so the nowrap pill ellipsizes (same as the chips) */
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.related-doc:hover {
+  color: var(--ink); /* ink on --bg 16.7:1 — the flat secondary hover */
+  text-decoration: underline;
+}
+
 /* "Maybe try" chips under a deflected bubble (phase 04). Unlike the
    onboarding row (which scrolls horizontally on mobile), this group wraps
    at every width: the chips are the actionable follow-up, not decoration.