fix: add Imagine RIT exercises to unit and track registries

The imagine-rit exercises were added to ALL_EXERCISES but not assigned
to a unit, causing the registry integrity test to fail in CI.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: oleglazari

src/exercises/registry.ts

@@ -87,6 +87,8 @@ export const UNITS: Unit[] = [
   { id: 'unit20-teaching-gaps', name: 'Exploitation Techniques', exerciseIds: ['gap-111', 'gap-112', 'gap-113', 'gap-114', 'gap-115'] },
   // Challenges
   { id: 'unit10-challenges', name: 'CTF Lab', exerciseIds: ['ctf-47', 'ctf-48', 'ctf-49', 'ctf-50', 'ctf-51', 'ctf-52'] },
+  // Imagine RIT
+  { id: 'imagine-rit', name: 'Imagine RIT', exerciseIds: ['rit-01', 'rit-02', 'rit-03', 'rit-04', 'rit-rop'] },
 ];
 
 export const TRACKS: Track[] = [
@@ -101,6 +103,7 @@ export const TRACKS: Track[] = [
   { id: 'glibc-bypass', name: 'glibc Bypasses', unitIds: ['unit19-glibc-bypass'] },
   { id: 'techniques', name: 'Exploitation Techniques', unitIds: ['unit20-teaching-gaps'] },
   { id: 'challenges', name: 'Challenges', unitIds: ['unit10-challenges'] },
+  { id: 'imagine-rit', name: 'Imagine RIT', unitIds: ['imagine-rit'] },
 ];
 
 export const BADGES: Badge[] = [