re: survey all 28 mission scripts -- kill counters are dead game-wide

All 28 StageNN.ssb decoded: 2,085,628 bytes, 25,705 call sites, 108 of 147
built-ins used. Verified the survey independently -- 33=0, 34=0, 108 distinct,
hp_pct_test 1955, unit_state 1271, all exact.

global_counter0/1 have ZERO call sites in all 28 stages. The handlers exist and
are wired; no mission calls them. So 'does a wave start after N kills?' is
answered for the whole game, not just Stage 02: no mission counts kills.

Two idioms change how the counts read. hp_pct_test(unit, 0.0) IS a destruction
test -- 1786 of 1955 calls (91%) pass 0.0, and the handler's zero path
additionally requires state == 4 -- so unit_state and hp_pct_test(...,0) are
interchangeable and stages just pick one. And squad_survival_pct is a boolean,
not a percentage: an integer divwu before the x100 means it can only be 0 or
100, and all 29 sites pass a friendly TCAF squadron with threshold 99.9, making
it 'has this escort lost anybody'. The game has no destroy-N%-of-a-squadron
objective.

Outliers: S18-S23 (tutorials) have no flag/trigger machinery at all -- linear
lessons; S16 has no unit predicates, only a descending player-gauge ladder.

Not settled: group_ratio_pct takes two unit indices (blob+4 and blob+12) and its
numerator lookup was not read to the bottom, so it is not being labelled
'percent killed by the player'. isl.py's UNIT_ARG omitted 71/72.

tools/re-capture/isl.py

@@ -135,6 +135,9 @@ def symbols(b, which):
 
 
 UNIT_ARG = {18, 20, 24, 26, 56, 69, 70, 94, 95, 105, 109}   # unit idx at blob[4]
+# Built-ins 71 and 72 carry a SECOND unit index at blob[12] (handler 0x8226E568
+# indexes [phase+324] with both), so their second operand printed as a bare
+# integer until this was noticed. 56 may be the same shape -- unverified.
 
 
 def dis(b, off, count=40, code_base=0x24, args=True, sym2=None):