chore(warnings): silence the four pre-existing script warnings the creation screen surfaced

Not errors and not regressions — Godot printed them on every script reload
and they predate M4-b. Cleared so a real warning is not lost in the noise:

- Redundant `const ContentDB`/`const NewGame` preloads that shadowed their
  own `class_name` globals (character_creation.gd, creation_draft.gd) — the
  class is already global, so the const bought nothing.
- Two `log` locals shadowing the built-in `log()` — renamed to `out`
  (canon_log.from_dict) and `canon` (NewGame.construct); the "log" dict KEY
  is the public contract and is unchanged.
- currency.format's copper->denomination division is integer BY DESIGN (the
  remainder is carried, not lost) — annotated `@warning_ignore` to say so.

319 client tests green; headless parse reports none of the four sites.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

client/scripts/state/currency.gd

@@ -31,10 +31,12 @@ static func format(copper: int) -> String:
 		return "0c"
 	var parts: Array[String] = []
 	var left := copper
-	var gold := left / GOLD          # int division
+	@warning_ignore("integer_division")  # denomination math — the remainder is carried, not lost
+	var gold := left / GOLD
 	if gold > 0:
 		parts.append("%dg" % gold)
 		left -= gold * GOLD
+	@warning_ignore("integer_division")
 	var silver := left / SILVER
 	if silver > 0:
 		parts.append("%ds" % silver)