Merge fire control (codex/fire-control-12) into master

Fire-control batches 1-8 with Soul passes, verified headless (Aetheria
Shared tests). Play smoke 2026-09-30: compile clean, steps 3-6 played
(pass/partial), steps 7-20 and fire-control checks A-F unplayed. The
operator preferred to merge now; Self ruled merge, with the unplayed
checks carried as open behaviours to verify through authored main-menu
scenarios (new Eureka cut). Report: docs/merge-to-master-checklist.md
section 8.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -100,6 +100,7 @@ Vault/Aetheria/.obsidian/plugins/copilot/data.json
 # come back.
 .scratch-*
 scratch-*
+tests/_scratch_*
 .codex/
 .codex-tmp/
 .evepkg/
@@ -108,3 +109,6 @@ scratch-*
 .nuget-sandbox/
 .dotnet-sandbox/
 .appdata-sandbox/
+
+# Stryker.NET mutation reports (regenerated per run)
+StrykerOutput/

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