Separate CADET from PILOT, and keep something in the air on HIVE MOTHER

The 24-seed run on the deterministic build put CADET at 17/24 and PILOT at
16/24. One win apart is not a difficulty setting, and PILOT is meant to be the
intended fight rather than a second easy mode: its rate-of-fire bonus goes from
0.28 to 0.45, which is the knob that costs the player something without paying
them back in salvage.

HIVE MOTHER's damage came out fine after the last change -- 1.0 to 4.3 hull --
but 38% of its fights still ended without a scratch, against 8-24% for the
other four. A threat made of escorts is a threat you can delete, and once the
bays are empty there is nothing in the air at all. Its last phase now runs a
spiral, so the pressure survives the escorts.

Determinism holds on all five bosses and the patrol. Worst frame with the extra
spiral, WARDEN phase 3 in co-op: 1.11 ms p99 against 16.7, with 103 bullets
live.

The 24-seed run measuring both of these is still in flight; its numbers, and the
pc/README.md table that still carries the pre-determinism figures, follow in the
next commit.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AKLqS4PgnCXrzKHDH8Cnzy

Author: softpython2884

pc/nova/boss.py

@@ -517,6 +517,12 @@ def act_hive(self, dt, combat):
         close instead of politely waiting its turn.
         """
         self.deploy_turrets(combat, 0)
+        if self.phase == 2:
+            # Its damage came out right but 38% of fights still ended clean:
+            # a threat made of escorts is a threat you can delete, and once
+            # they are down there is nothing in the air. The last phase keeps
+            # something in the air whatever happens to the bays.
+            self.spiral(dt, combat, arms=2, rate=-2.2, speed=96)
         self.spawn_t -= dt
         if self.spawn_t <= 0:
             self.spawn_t = (3.0, 2.4, 1.8)[self.phase]

pc/nova/data.py

@@ -407,7 +407,7 @@ def SEC_ACCENT(sector):
 # The tiers separate on rate of fire and on the depth of the hull bar instead.
 DIFFICULTIES = (
     ("CADET", 24, 0.85, 0.0, "Forgiving. Learn the patterns."),
-    ("PILOT", 18, 1.00, 0.28, "The intended fight."),
+    ("PILOT", 18, 1.00, 0.45, "The intended fight."),
     ("ACE", 12, 1.15, 0.78, "Fast, dense, unkind."),
 )