phase: 157_chat_chip_cap

All verification is green. Final report:

**Phase 157 — final verification pass (all 3 tasks already complete in `complete/`)**

- Verified the implemented work matches the design: `CHIP_CAP = 90` constant + display-only cap in `renderChips` (`slice(0,90).trimEnd() + "…"`), `title`/`aria-label`/click payload byte-unchanged; unit pins (89/90/91 letter & space, full-text invariant, short-string guard, Maybe-try single-path guard); phase-104 E2E updated to the cap contract
- Full suite `uv run pytest --cov=app --cov-report=term-missing`: **3578 passed**, app/ coverage **99%** (>90% ✓)
- `uv run ruff check .` clean; `uv run pyright`: 0 errors
- Dedicated E2E `uv run pytest tests/e2e/test_chat_chip_cap.py -v --no-cov`: **4/4 passed** in isolation (DB up)
- Cross-phase regression: phase-104 E2E 6/6, phase 05/80/103 chip suite 8/8 (seed chips <90 chars — cap is a no-op, assertions hold)
- Criteria: ≤91-char capped display ✓ (byte-for-byte pin) · click submits FULL 120-char question (user bubble) ✓ · `title` + clipped-case `aria-label` carry full text ✓ (375px viewport) · <90-char byte-identical ✓ (unit + live DOM) · commit: deferred to the harness (per harness protocol, overrides AGENTS.md rule 8 for this pass)
- Documentation: README.md reviewed in full — every `.env.example` var documented, all referenced scripts/pages/commands verified against the tree, the phase's chip-cap note is in the Chat section; AGENTS.md verified (commands, test files, layout-rule citations — phase 157 adds no new layout principle) → **verified consistent, no changes needed**
- No live-infrastructure changes were required or made
- Next pending phase: **158_thinking_timeline**

README.md

@@ -87,7 +87,10 @@ the viewer's back link to Chat, one opened from Sources returns to Sources
 onboarding suggestion chips
 follow the opening questions of the 3 most recent saved chats (each
 chat's first question — a follow-up never chips, phase 103) — on a
-fresh deployment they seed from `BOR_SUGGESTIONS`.
+fresh deployment they seed from `BOR_SUGGESTIONS`. A long opening
+question caps at 90 displayed characters with a `…` (phase 157) — the
+full text stays in the hover tooltip, and clicking the chip submits
+the full question.
 
 The document's meta row (the chat modal **and** the standalone viewer at
 `/document.html`) carries a **Copy path** button: one click copies the