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/integration/test_document_content.py

@@ -422,11 +422,16 @@ def test_content_200_all_fields(client, db) -> None:
         assert r.status_code == 200
         body = r.json()
         # Wire-additive (phase 106, task 05): ``created_at`` joins the
-        # content shape (after ``summary``, before ``content``).
+        # content shape (after ``summary``, before ``content``) — and
+        # (phase 122, task 04) ``is_image`` joins it ALWAYS present
+        # (text docs: false); ``image_url`` is ABSENT for a text doc
+        # (never null — the ``DocContent`` omission rule).
         assert set(body) == {
             "source", "path", "title", "format", "summary", "created_at",
-            "content", "indexed_at", "chunks",
+            "content", "indexed_at", "chunks", "is_image",
         }
+        assert body["is_image"] is False
+        assert "image_url" not in body  # absent — never null (text doc)
         datetime.fromisoformat(body["created_at"])  # raises if not ISO-8601
         assert body["source"] == "Homelab"
         assert body["path"] == "kubernetes.md"