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>
DynamicValueSpellOracleTests proves the engine COMPUTES an effect magnitude
from live game state (the value the wire can't carry). Card 112134010's
`when_play damage={me.play_count}-1` resolves via the proven IsForecast/
IsRecovery + ActionProcessor.PlayCard (DP4) path; the oracle asserts the
damage equals the engine's own live GetCurrentTurnPlayCount() - 1, not a
literal. Seeds play_count via M4's AddCurrentTrunPlayCount seam; lone
surviving enemy 13/13 gives a clean life-delta; selectedCards: null
(auto-target AoE). 10/10 green; zero Engine/shim/manifest changes; drift
clean. First-unknown resolved by the first RED: the per-play +1 lives in
OnBeforePlayCard (wired only via OperateMgr/Prediction), so the direct-
ActionProcessor harness reads exactly the seeded count (damage == seeded-1);
load-bearing proven by varying the seed 4->7 and watching damage track 3->6.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
