- DiffBlock: an empty side contributes zero lines and a trailing newline is a
terminator, so a create ending in a newline draws one added line (not a
phantom empty one) and a full deletion draws no phantom + line.
- diffCardModel: narrow the wire diffs payload (card is the only validated
field) so a malformed diff card falls back to the generic path instead of
throwing inside DiffBlock.
- FileMutationRow: surface the result text when an errored mutation has no diff
card, so a failed edit/write is more than a red dot.
- copyText ends its closed union on assertNever.
- Docs: drop the "bridge relativizes" claim, record the file-count divergence
from the TUI footer, correct the built-boot overclaim, note why the row title
outranks the view title, and make fixture turn 67 args self-consistent.
- Tests: terminator/empty-side/interior-blank rows, wire-narrowing null arms,
the error-text arm and its name/code fallback, stopped state, no-path summary,
and the registration/disposal shape.
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