F.0.1:10 - Rationale

Meaning is cheapest to recover where a source actually uses an expression. Starting with the source passage prevents a later comparison from rewriting the source before the commonality or difference is known. Keeping durable cell identity in F.17 and cross-local relations in F.9 prevents local recovery from becoming a second ontology or relation catalogue.

The proportional split also protects practical use: one identified source can yield an answer immediately; several possible sources call for F.1; several source ontologies call for F.0.2; an actual relation calls for F.9.