CB-WP-0042 T05: H2 measured — it largely succeeds where H1 failed

Measured against ground-game's own §3 criteria, read from their design
note rather than reused from H1.

Criterion 1 met with room: greedy SHARED wins 120 at 3p and 175 at 4p,
against H1's 0 and 0, restoring 73% and 92% of baseline.

Criterion 3 met, and it was H1's clearest failure. Under H1 the
unregulated seat armed DARVO constantly and never won; under H2 it arms
and wins 13/13/57. "Non-zero for some policy that still sometimes wins" is
exactly the shape H1 could not produce.

Criterion 2 met at 2p/4p/6p and missed at 3p — 1.50 against baseline's
1.57 — reported as a miss because that is what this sample says. The
mechanism is visible: H1-greedy's spread is 0.00 at 3p+, because a flat
tax on every seat creates no variance at all. That is the clearest
statement of why scoping was the right correction.

Criterion 5 is the best evidence in the pass. Forcing every scope to
global and changing nothing else reproduces H1's collapse exactly — 120 to
0 at 3p, 175 to 0 at 4p — so the scoping is what saves it, not any other
difference between the packages.

Criterion 4 came out backwards and the prediction held. The workplan said
this panel might be unable to test it, because no policy here models
another seat or knows what a scope is; bond claim rates are LOWER than
personal at 3p and 4p, driven by suit availability rather than incentive.
Reported as untested with an incidental figure pointing the wrong way,
not as a refutation.

Wired into make panels. First pass declared after ADR-0021, so no chaos
roll is recorded.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Makefile

@@ -238,6 +238,7 @@ panels:
 	@cargo run --release -q -p games-ground --example attack-value
 	@cargo run --release -q -p games-ground --example regulation
 	@cargo run --release -q -p games-ground --example perfect-recall
+	@cargo run --release -q -p games-ground --example h2-panel
 
 # CB-WP-0022 T05: the design-finding register, reported over
 # specs/GroundRules.md. Shows the QUEUE by default; the log of closed