refactor(client): remove archetype selection, fix Randomise→Randomize

- Remove character_select.tscn and character_select.gd entirely
  (Smuggler/Detective archetypes removed per v0.2 pivot)
- New Game goes straight to character creation
- Rename Randomise→Randomize throughout (US English convention)
- Add *.import and *.uid to client gitignore (import artifacts)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -9,10 +9,12 @@ tooling/line-previewer/target/
 tooling/test-client/target/
 content-ron/
 
-# Godot client (further ignores managed by client team)
+# Godot client
 client/.godot/
 client/export/
 client/reports/
+client/**/*.import
+client/**/*.uid
 
 # Renderer (separate Godot project for sprite pipeline)
 renderer/.godot/