Add consume_pending_promotions phase to the end-turn step (after combat XP):
validates each unit's pending_promotion against its applied promotions
(requires-chain, no-dupes, existence), records it, folds hp_bonus into max_hp,
applies heal_on_promote (clamped), clears the pick. Illegal picks are dropped.
Inject per-unit promotion combat modifiers at both PvP combat sites, mirroring
equip_combat_bonus: attacker offence keys off its tile biome + defender flags,
defender defence off its own tile + whether the attack is ranged. Percentages
fold into flat atk/def/ranged against base stats. Projection now gauges
promotion_available against the real level (promotions.len()).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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