Adds regression tests for Sprint 3 items that were verified
already-done during recon but had no dedicated test coverage:
- viewer::tests::hex_edit_apply_nibble_at_eof_is_safe_noop
Locks in the C8 contract: apply_nibble at cursor past EOF
is a safe no-op (no panic, no spurious modified flag).
- viewer::tests::move_cursor_clamps_to_size
Locks in the C8 cursor bounds invariant at move_cursor
level: positive deltas clamp to file size, negative deltas
clamp to 0 with no underflow.
- filemanager::panel::tests::history_dedups_consecutive_entries
Locks in the C11 contract: refreshing the same directory
N times grows the history by 1 entry (consecutive dedup),
not N.
- filemanager::panel::tests::sort_field_mtime_round_trips_through_config
Locks in the C12 contract: 'mtime' and 'time' config
strings both resolve to the Mtime sort field, and the
Panel reports the human-readable name 'Mtime'.
Tests (4 new, total 1299 passing):
+hex_edit_apply_nibble_at_eof_is_safe_noop
+move_cursor_clamps_to_size
+history_dedups_consecutive_entries
+sort_field_mtime_round_trips_through_config
kellito
2db8636f8b