Constant ENEMY_MID_BUMP

pub const ENEMY_MID_BUMP: f64 = 8.0;

Mid-game enemy bump — applied only to CampaignBossFight (ch7–15). Applied via OVERLORD_BAL_ENEMY_MID_BUMP. At 8.0 the boss at ch7 has effective power 687 × STEP^0.5 × 8 ≈ 6265 vs a frozen player’s ~2121 (P/E ≈ 0.34 → ~7% first-try win rate), while an engaged player (power ~3274) has P/E ≈ 0.52 — with stop_on_lose=true and boss-stop-on-loss retries, even a 50% single-shot rate means the free bot quickly clears it via quest-funded chest opens between attempts, while the lazy bot has no path to more power. Combined with stop_on_lose=true on campaign boss fights and the lazy-bot strategy not retrying boss fights, this creates the hard engagement gate: freeze at 1-6, wall at the ch7 boss. Wave fights are unaffected (the bump is applied in enemy_power_scalar, not in enemy_power_for_chapter), so the global power curve stays monotone.