fix(client): resolve all gdlint warnings — zero warnings policy

Fix 354 gdlint warnings across 65 files: 194 class-definitions-order
(reorder declarations), 138 max-line-length (split long lines),
22 code issues (unused args, no-else-return, naming). Update .gdlintrc
to exclude addons/ and raise max-public-methods for test files.
No logic changes — declaration order, whitespace, and naming only.

Ticket: #783

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

client/tests/test_protocol_bridge.gd

@@ -346,7 +346,7 @@ func test_full_v6_snapshot_decode() -> void:
 		],
 		"entities": [
 			{"entity_id": 1, "x": 10.0, "y": 10.0, "z": 0, "kind": "Player",
-			 "visibility": "Forward", "relationship": "Unknown", "observation": "Visible"},
+				"visibility": "Forward", "relationship": "Unknown", "observation": "Visible"},
 		],
 		"visible_tiles": [
 			{"x": 10, "y": 10, "z": 0, "visibility": "Forward", "tile_kind": "Floor"},