docs(milestones): add education, legacies, governments, factions, and more

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>

MASTERPLAN.md

@@ -200,6 +200,17 @@ Use Sandbox decision to gain powers. All metallic arts events fire correctly.
   with joining, progression, coppermind sharing, Ministry discovery risk)
 - Add kandra trait and kandra Contract mechanics (kandra characters are
   shapeshifters bound by Contracts)
+- Custom education system with 5 tracks mapped to lifestyles: Allomantic
+  Training (→Metallic Arts), Noble Court Education (→Noble Intrigue), Ministry
+  Indoctrination (→Steel Ministry), Skaa Survival (→Underground), Keeper
+  Apprenticeship (→Scholarship). 20 education traits (4 tiers × 5 tracks),
+  snapping can trigger during Allomantic Training, Keeper education produces
+  network initiates. Suppress vanilla education.
+- Dynasty legacies: 5 universal legacy trees (Allomantic Bloodline, Political
+  Dominance, Ministry Connections, Metallurgic Wealth, Underground Network) with
+  5 tiers each, plus 10 house-specific 3-tier legacies for each Great House.
+- Custom death reasons (12 Mistborn-specific causes) and ~15 character nicknames
+  ("the Survivor," "Ash Lord," "the Liberator," etc.).
 - Create artifact system (Royal Court DLC) with 9 core types: mistcloaks,
   metal vial sets, glass/obsidian weapons, dueling canes, koloss swords,
   copperminds, metalmind sets, Lord Ruler's atium bracers (unique legendary),
@@ -274,6 +285,24 @@ and Pits of Hathsin have special buildings. Names are Scadrial-appropriate.
   innovations representing Imperial stagnation) and "Age of Liberation" era (~8
   innovations locked until the Lord Ruler falls). Keeper Network accelerates
   post-rebellion research. Vanilla eras fully suppressed.
+- Custom government types: Imperial Appointment (noble houses, no partition,
+  Lord Ruler appoints), Theocratic Ministry (Steel Ministry cantons, piety
+  focus), Post-Rebellion Elective (council election after Lord Ruler falls).
+  Suppress vanilla feudal/tribal.
+- Custom factions: Skaa Rebellion, Ministry Loyalist, Noble Reform, Keeper
+  Underground, Cult of Ruin. Each with setting-appropriate demands and
+  ultimatums. Lord Ruler can intervene against factions.
+- Custom vassal contracts: Plantation Tribute, House Guard Obligation, Atium
+  Tithe, Allomantic Service, Inquisition Access, Title Revocation. Mistborn-
+  specific terms with Lord Ruler attention interactions.
+- Custom secret types (8): secret Allomancer, hidden skaa heritage, Keeper
+  identity, kandra imposter, atium hoard, crew membership, Ministry informant,
+  secret Survivorist. Custom hooks from secret discovery. Integrates with
+  Inquisitor investigation and council tasks.
+- Custom court types (Royal Court): Noble Keep (grand, political), Ministry
+  Canton (austere, bureaucratic), Underground Hideout (rebel, secretive).
+- Portrait modifier system (triggers defined, art in M8): hemalurgic spike
+  eyes, Allomancer burn marks, ash-stained clothing, Terris robes, mistcloaks.
 - Full testing pass — error.log review, 20-year playthrough, verify no vanilla
   anachronisms visible
 
@@ -286,14 +315,18 @@ and Pits of Hathsin have special buildings. Names are Scadrial-appropriate.
 - `common/court_positions/00_mistborn_court_positions.txt` — court roles
 - `common/laws/00_mistborn_laws.txt` — caste laws
 - `common/culture/innovations/00_scadrial_innovations.txt` — custom eras
+- `common/governments/00_mistborn_governments.txt` — custom governments
+- `common/factions/00_mistborn_factions.txt` — custom factions
+- `common/vassal_contracts/00_mistborn_contracts.txt` — custom contracts
+- `common/secret_types/00_mistborn_secrets.txt` — custom secrets
+- `common/court_types/00_mistborn_court_types.txt` — court types
 - Province modifier definitions in `common/modifiers/`
-- `localization/english/` — new localization for CB, schemes, provinces, council,
-  laws, innovations
+- `localization/english/` — massive expansion
 
 **Exit criteria:** A friend can install the mod and play. The world feels like
-Scadrial — Scadrial names, ash terrain, Mistborn mechanics, caste system, no
-vanilla anachronisms. Custom wars, schemes, council, and laws work. Innovation
-system shows Imperial stagnation.
+Scadrial — Scadrial names, ash terrain, Mistborn mechanics, caste system,
+Imperial government, custom factions, no vanilla anachronisms. All core CK3
+systems are Mistborn-themed.
 
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