v3.3.0

• diff is now diff-aware by default: it reports only the issues on newly-added lines, not pre-existing debt in files you happened to touch — so the gate blocks what was just written
• Transparent (shows how many pre-existing findings were hidden); --all-lines restores the whole-file view; pure git-free hunk parser, unit-tested
• No rule or tool changes (438 / 37); gate green (PASS/A/0)