phase: 122_image_documents

**Phase 122 (image documents) — final verification pass: all green. No code changes were needed; defects found: none.**

**Verified (implementation already complete in working tree, reviewed end-to-end):**
- Toggle (`BOR_IMAGES`/`BOR_IMAGE_EXTENSIONS`/`BOR_IMAGE_DIR`, off by default) + `GET /api/config` `images` flag
- Ingest: bytes digest, `image_dir` persistent copy, `content = summary = vision description` (chat-model call; only text embedded), fail-soft skip + `images_failed` counter
- Serve/display: `/api/documents/{id}/image` route (404 matrix), viewer `<img>` + description, Sources 48px lazy thumbnails, chat inline source figure (alt = summary), agent `read` marker
- Prune guard: images-off syncs never prune `is_image` docs

**Test / lint / coverage (exact commands & outcomes):**
- `uv run pytest` → exit 0 (green; note: pytest 9.1.1 `-q` omits the final count line in output — exit code authoritative)
- `uv run pytest --cov=app --cov-report=term-missing` → **2715 passed, exit 0, TOTAL 99%** (>90% gate)
- `uv run ruff check . && uv run pyright` → "All checks passed!" / "0 errors, 0 warnings, 0 informations"
- `uv run pytest tests/e2e/test_image_documents.py -v --no-cov` → **4 passed, exit 0** (isolation)

**Completion criteria:** (1) images=true → described/embedded/displayed docs: ✅ (E2E + integration) · (2) images=false byte-identical + image docs survive sync: ✅ (E2E negative app + unit/integration) · (3) viewer + chat rendering with alt text; failed description skips + logs, sync completes: ✅ · (4) test/lint/coverage gates: ✅ · (5) commit + phase move: deferred to harness per this pass's rules (working tree left uncommitted).

**Notable deviation (pre-existing, documented in code):** image route uses `require_user` (phase-79 posture, same gate as the document content endpoint) rather than the phase text's "public" parenthetical — matches the endpoint it mirrors.

**Next pending phase:** `123_chat_image_questions`.

tests/fakes.py

@@ -1,6 +1,8 @@
 """Shared test fakes (no network, deterministic)."""
 from __future__ import annotations
 
+from typing import Any
+
 from app.config import Settings
 from app.rag.llm import LLMError
 
@@ -15,6 +17,11 @@ class FakeEmbedder:
     ``"Summary of <first token of the user content>"`` and raises
     :class:`LLMError` when the content contains the sentinel word
     ``SUMMARY-BLOWUP`` (drives the importer's fail-soft summary path).
+    ``content`` may be a string or a phase-122 multimodal part list
+    (``dict[str, Any]`` messages, the ``LLMClient.chat`` shape) — the
+    text-summary body above is string-only; a subclass handling the
+    multimodal image description (task 03's vision mock) overrides
+    ``chat``.
     """
 
     def __init__(self, dim: int = 768) -> None:
@@ -36,7 +43,7 @@ class FakeEmbedder:
         return vec
 
     async def chat(
-        self, messages: list[dict[str, str]], model: str | None = None
+        self, messages: list[dict[str, Any]], model: str | None = None
     ) -> str:
         self.chat_calls.append(list(messages))
         user = next((m["content"] for m in messages if m.get("role") == "user"), "")