feat(client): sprint 38 — free camera viewer, archetype strip, test fixes

- Add free camera mode (F4 toggle): WASD pan, scroll zoom, decoupled
  from player position (#898)
- Strip archetype-driven code: remove character_archetype, lattice_profile,
  and lattice color palettes from client (#882)
- Fix confrontation_monologue signal not firing in headless test mode (#867)
- Revive fog state behavioral tests: EXP_EXPLORED persistence, grow-only
  bounds, texture-resize copy, BoundaryWall handling (#879)
- Triage pre-existing test failures: fix examine_display dismiss timing,
  fog test position fragility, rendering snapshot assertions,
  time_display format (#871)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

client/scripts/protocol/protocol.gd

@@ -613,34 +613,15 @@ static func _decode_enum_variant(raw) -> Dictionary:
 # -- Encode: GDScript types → bytes to server ----------------------------------
 
 
-## Encode a StartupMessage to MessagePack bytes (#175, #588, #718).
+## Encode a StartupMessage to MessagePack bytes (#175, #718).
 ## Sent by the client immediately after handshake validation.
-## Server reads this to initialize SimRng (D-010, D-029) and select monologue pool (D-032).
-## character_archetype: "detective" → "Detective", "smuggler" → "Smuggler" (server enum variant).
+## Server reads this to initialize SimRng (D-010, D-029).
 ## character_visual: optional CharacterVisualDescriptor — included as "character_visual_descriptor" dict.
 static func encode_startup_message(
-	world_seed: int, character_archetype: String = "detective", character_visual: Variant = null
+	world_seed: int, character_visual: Variant = null
 ) -> PackedByteArray:
-	# Map client lowercase archetype string to server PascalCase enum variant.
-	# Explicit match prevents unknown strings silently reaching the server as
-	# garbage enum values — fail loudly and fall back to "Detective".
-	var archetype_variant: String
-	match character_archetype:
-		"detective":
-			archetype_variant = "Detective"
-		"smuggler":
-			archetype_variant = "Smuggler"
-		_:
-			push_error(
-				(
-					"Protocol: unknown character_archetype '%s' — defaulting to 'Detective'"
-					% character_archetype
-				)
-			)
-			archetype_variant = "Detective"
 	var msg := {
 		"world_seed": world_seed,
-		"character_archetype": archetype_variant,
 	}
 	if character_visual != null and character_visual.has_method("to_dict"):
 		msg["character_visual_descriptor"] = character_visual.to_dict()