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`.

.env.example

@@ -112,6 +112,20 @@ BOR_IMPORT_EXTENSIONS=md,markdown,txt,yaml,yml,json,py,container,network,volume,
 # BOR_UPLOAD_MAX_MB=512   # caps BOTH the compressed upload and the total
                           # extracted bytes (zip-bomb guard); must be > 0
 
+# --- Image documents (phase 122) ---
+# Master switch for indexing standalone image files (direct uploads,
+# uploaded archives, git/local source walks) as first-class documents.
+# OFF by default — enable only when BOR_LLM_CHAT_MODEL supports vision:
+# the chat model generates the image's description, and that
+# description is the ONLY part of the image that gets indexed (the
+# embedding model never sees pixels). While off, image files are
+# ignored by the import walks and a sync never prunes existing image
+# documents.
+# BOR_IMAGES=0                        # 1 = index standalone images
+# BOR_IMAGE_EXTENSIONS=png,jpg,jpeg,webp,gif,bmp  # comma-separated, case-insensitive
+# BOR_IMAGE_DIR=~/bor-sources/images  # persistent home for the served image bytes
+                                      # (uploads are replaced, checkouts re-cloned)
+
 # --- Docs push (phase 59: save a chat answer as documentation) ---
 # The git repo chat answers can be committed to — any remote (URL or
 # local path). While empty, the "Save as doc" action is hidden and the