Pin black version to ^23.12.0 for CI consistency

Fix linting: ruff import sorting and black formatting

build idle

build idle

fix: scope leann search by project

build idle

lean

chore: log engram index stats on startup

fix: set embedding_dim when loading memory rows

fix: load memories for LIKE fallback

fix: guard empty hybrid rerank candidates

fix: guard empty selected before scoring

fix: add safety check for empty selected candidates

fix: guard leann_engine + log Engram candidates in rerank

fix: add missing embedding_dim field to Memory model