copilot suggestions

Author: qchapp

README.md

@@ -278,7 +278,7 @@ User Input (Image + Text Query)
 | Variable | Description | Default | Required |
 |----------|-------------|---------|----------|
 | `OPENAI_API_KEY` | OpenAI API key | - | ✅ |
-| `EPFL_API_KEY_EMBEDDER` | API key for remote reranker endpoint | - | ✅ (for reranking) |
+| `EPFL_API_KEY_EMBEDDER` | API key for remote embedder and reranker endpoints | - | ✅ (when `retrieval.embedder.backend: remote` and/or `retrieval.reranker.backend: remote`) |
 | `GITHUB_TOKEN` | GitHub token for repo info | - | ❌ |
 | `SOFTWARE_CATALOG` | Path to catalog JSONL | `dataset/catalog.jsonl` | ✅ |
 | `TOP_K` | Retrieval candidates count | `8` | ❌ |

src/ai_agent/utils/previews.py

@@ -29,7 +29,7 @@ def _fingerprint_paths(paths: List[str]) -> tuple[str, ...]:
         pp = Path(p)
         try:
             st = pp.stat()
-            fps.append(f"{pp.resolve()}::{int(st.st_mtime)}::{st.st_size}")
+            fps.append(f"{pp.resolve()}::{st.st_mtime_ns}::{st.st_size}")
         except Exception:
             fps.append(str(pp))
     return tuple(fps)