feat(mc-turn): p3-26 B1+B2 — happiness/golden-age + unit/city healing phases
Port two per-turn subsystems from GDScript into the headless Rust turn engine.
**B1: Happiness + Golden Age tick**
- New: src/simulator/crates/mc-turn/src/happiness_phase.rs
- pub fn process_happiness_phase(state: &mut GameState)
- Assembles HappinessInput from PlayerState (city_count, total_citizens,
traded/owned luxuries, building_happiness, growth_tier)
- Runs mc-happiness::calculate_happiness → writes PlayerState::happiness +
happiness_status
- Advances golden-age meter via mc-happiness::process_golden_age → writes
golden_age_active/turns/progress/count
- 6 unit tests covering surplus triggers, meter accumulation, count-down,
tier defaulting, multi-player independence
- mc-happiness moved from [dev-dependencies] to [dependencies] in mc-turn/Cargo.toml
**B2: Unit + city healing tick**
- New: src/simulator/crates/mc-turn/src/healing.rs
- pub fn process_healing_phase(state: &mut GameState)
- Units: rest-condition guard (movement_remaining == base_moves || is_fortified),
captive skip; rates: garrison=20, fortified-territory=15, neutral=10
- Cities (bench CityState): +20 HP/turn clamped to max_hp
- 10 unit tests covering garrison/fortified/neutral/moved/capped/captive/city cases
**GameState/PlayerState fields added to mc-state (all #[serde(default)])**
- PlayerState::happiness: i32
- PlayerState::happiness_status: String
- PlayerState::growth_tier: String
- PlayerState::owned_luxuries: BTreeMap<String, i32>
- PlayerState::golden_age_active: bool
- PlayerState::golden_age_turns: i32
- PlayerState::golden_age_progress: i32
- PlayerState::golden_age_count: i32
- PlayerState::building_happiness: i32
CONTRACT: process_happiness_phase and process_healing_phase are NOT wired
into TurnProcessor::step — caller wires them at the correct phase slots.
cargo test -p mc-turn: 265 passed, 0 failed (lib) + all integration suites ok.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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