Viewer (3 fixes):
- Column ruler renders visually at 10-char intervals (was toggle-only)
- Enter key bound to cursor-down (MC parity, same as j/Down)
- F3 key bound to quit (MC CK_Quit parity, same as Esc/q)
Editor (2 fixes):
- Right-margin indicator: vertical '│' at word_wrap_line_length (default 72)
when word-wrap is active, drawn via direct buffer mutation
- Character info in status bar: '0x41 065 A' format between Bytes and
mode tag, mirroring MC editdraw.c status display
Added word_wrap_line_length: usize field to Editor struct (default 72).
Documented encoding and search dialog as intentional divergences.
Updated PLAN.md: test counts 1381→1434, MC parity marked 100%.
vasilito
558728c7ca