v0.2.1

Patch on top of v0.2.0.

• kg doctor gains an embedding-dim-binding check. graphiti reads EMBEDDING_DIM from the environment once, at import time, and uses that constant to build zero vectors during search. If anything imports graphiti before the value is set, searches are built at the wrong width while the embedder returns the right one, and nothing reports it. The check compares the constant graphiti actually resolved against embedder.dimensions.

  This matters most on the local profile, where nomic-embed-text returns 768 and graphiti's own default is 1024.

• The export header no longer implies an import command exists; embeddings are omitted because they are derived from the text under whichever embedder is in use.