Three follow-up review items from Copilot:
- parseDiffStat now handles git's binary-diff format (`path | Bin A ->
B bytes`) using the byte delta with a floor of 1. Without this,
binary edits arrived at the attribution payload as diffSize=0 and
were silently dropped. Also extracted the parser to a top-level
exported function so the binary path is unit-testable; added five
targeted cases (text/binary/rename normalisation/summary skip).
- attachCommitAttribution now passes `this.config.getModel()` into
generateNotePayload instead of the user-configurable
`gitCoAuthor.name`. The note's `generator` field reflects which
model produced the changes — and CommitAttributionService's
sanitizeModelName() actually has the codename to scrub now.
- generate-settings-schema.ts imports SETTINGS_VERSION instead of
hardcoding `default: 3`, so a future bump propagates to the emitted
JSON schema in one place. Regenerated settings.schema.json bumps
$version's default from 3 to 4 to match the V4 migration.