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/canon_log/canon_log.gd

@@ -99,17 +99,17 @@ static func from_dict(d: Dictionary) -> CanonLog:
 	if v != SCHEMA_VERSION:
 		push_error("unsupported canon_log schema_version: %s" % v)
 		return null
-	var log := CanonLog.new()
-	log.player = LogPlayer.from_dict(d.get("player", {}))
-	log.location = LogLocation.from_dict(d.get("location", {}))
+	var out := CanonLog.new()
+	out.player = LogPlayer.from_dict(d.get("player", {}))
+	out.location = LogLocation.from_dict(d.get("location", {}))
 	for m in d.get("party", []):
-		log.party.append(PartyMember.from_dict(m))
+		out.party.append(PartyMember.from_dict(m))
 	for e in d.get("recent_events", []):
-		log.push_event(e)
+		out.push_event(e)
 	for f in d.get("established_facts", []):
-		log.add_fact(f)
+		out.add_fact(f)
 	for q in d.get("active_quests", []):
-		log.active_quests.append(Quest.from_dict(q))
+		out.active_quests.append(Quest.from_dict(q))
 	for h in d.get("humiliations", []):
-		log.humiliations.append(Humiliation.from_dict(h))
-	return log
+		out.humiliations.append(Humiliation.from_dict(h))
+	return out