Conflicted revisions read every file through jj file show, which returns
empty output for symlinks and causes repository-wide subprocess fanout.
Keep ordinary Git blob sources and immutable identities; render only
selected conflicted paths through jj.
Verified all 905 tests and the original local bookmark comparison with
25 correct paths in 0.522s, plus actual terminal conflict viewing.
Strict Clippy is blocked by existing diagnostics outside this change.
Valdemar Lorenzen
hl-valdemar