phase: 123_chat_image_questions

All gates green. Verification complete.

**Phase 123 — final verification pass (all 4 tasks already in `complete/`)**

- Verified the full implementation is in the working tree: `app/api/chat_images.py` (upload/serve pair), `ChatRequest.image`/`ChatMessage.image` (path-validated, omitted-when-None), toggle-off + stale-file hinted error frames, `build_user_content` multimodal build at both sites (chat.py deflected branch + `run_agent`), config-gated composer attach/preview/upload-then-send, restore + shared rendering, CSP `img-src 'self' data:` carve-out, mock-LLM capture buffer.
- `uv run pytest` → **2796 passed**, exit 0 (unit + integration).
- `uv run pytest --cov=app --cov-report=term-missing` → **TOTAL 99%** (29/4615 missed; phase-123 modules 99–100%).
- `uv run pytest tests/e2e/test_chat_image_questions.py -v --no-cov` → **5 passed** in isolation.
- `uv run ruff check . && uv run pyright` → clean (0 errors).

**Completion criteria:** (1) attach→send→multimodal text+image to the model, bubble/reload/shared all render it, saved chat stores the PATH with `"base64" not in json.dumps(stored)` — **verified** (E2E tests 1–4 + integration round-trip); (2) `BOR_IMAGES=false` — control hidden, exact hinted error frame, zero model calls / no query_log row — **verified** (E2E test 5 + integration); (3) text-only byte-identical (`content` stays a plain `str`) — **verified** (unit + integration); (4) all gates green — **verified**; (5) commit + phase move — left to the harness per pipeline rules (no `git add`/`commit` run).

No defects found; no live-infrastructure changes (repo + local dev DB only). **Next pending phase: none** — 123 is the last phase in `todo/`.

tests/e2e/test_security_headers.py

@@ -33,8 +33,13 @@ import re
 
 from playwright.sync_api import ConsoleMessage, Page, expect
 
-#: The exact owner-approved policy (phase 82, decision A1).
-CSP = "default-src 'self'; base-uri 'none'; frame-ancestors 'none'"
+#: The exact owner-approved policy (phase 82, decision A1), with the
+#: phase-123 img-src carve-out (the question-image composer's data-URL
+#: preview + live bubble — ``data:`` is allowed for images ONLY).
+CSP = (
+    "default-src 'self'; base-uri 'none'; frame-ancestors 'none'; "
+    "img-src 'self' data:"
+)
 
 #: Chromium reports CSP denials to the console with this phrasing
 #: ("Refused to … because it violates the following Content Security