Expand M3 with custom education system (5 tracks × 4 tiers), dynasty
legacies (5 universal + 10 house-specific), custom death reasons (12),
and character nicknames (~15). Expand M4 with custom government types
(3), factions (5), vassal contracts (6 terms), secret types (8), hooks
(3), court types (3), and portrait modifier system (10 triggers).
Update MASTERPLAN scope to reflect all new systems.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>