Step 6 of multi-instancing migration. HeadlessEngineEnv.EnsureInitialized
is split into EnsureProcessGlobals (idempotent, process-once) +
SeedCharaIdsOnCurrentAmbient (per-test). New TestBattleScope IDisposable
sets up a fresh BattleAmbientContext per test. NonParallelizable removed
from converted classes; assembly-level Parallelizable(Fixtures) enabled.
SVSim.BattleEngine.Tests fully green under parallel test execution.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
First card to exercise the selectedCards path of ActionProcessor.PlayCard
(dormant through M2-M5, all of which played selectedCards: null). Spell
800134020 (clan-1 cost-1, when_play damage=5 to a select_count=1 enemy
follower) resolves headless: with two vanilla followers on the enemy board
and one passed as selectedCards, the damage hits ONLY the selected follower
(13->8) and the un-selected one is untouched (7).
New oracle dimension: SELECTION ROUTING via a differential life-delta on two
surviving targets (selected -5, un-selected 0) — reads the authoritative
damage path M3 proved, with no dependence on follower death/board-removal
timing. Load-bearing confirmed (M4 discipline): swapping which follower is
selected makes the damage follow the selection (assertions fail for the right
reason), then reverted to green.
Like M4, a clean milestone: NO new engine/shim work — the selectedCards path
resolved on the existing shim surface. The only authoring was test-side: the
M6 card constants, a shared HeadlessEngineEnv.PutFollowerInPlay primitive
(create via the null-view seam + drive HandCardToField), and the oracle.
Engine still 0 errors; check_drift clean; dotnet test -> 6/6 green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
