Add /run-firestorm skill: driver to launch/drive/screenshot game + editor

driver.ps1 commands: status/windows, report <Mission> (headless editor
mission-load smoke test), editor-start, game-start, shot/shotwin, click,
stop. All flows verified live: Coliseum report (248 entities), editor UI
screenshot, game console screenshot + Map-tab click. Screenshots dir is
gitignored (can capture the operator desktop).

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

.gitignore

@@ -6,3 +6,6 @@
 #
 # (Intentionally empty. Add entries here only for truly machine-local, non-portable
 #  state you decide you never want mirrored.)
+
+# run-firestorm skill screenshots (may capture the operator's desktop -- never mirror)
+.claude/skills/run-firestorm/shots/