fix(client): address PR #54 round 2 — stale comments, D-076 test, GROUND_FLOOR const

Remove stale smoothing re-enable comments from main.gd (Hoshe #1).
Add DIALOGUE_MAX_WIDTH=640 regression test (Hoshe #2).
Extract GROUND_FLOOR const in tile_renderer (Tyre #3).
Clean up entity_renderer migration comment (Hoshe #3).

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

client/scripts/main.gd

@@ -26,7 +26,7 @@ var _last_dialogue_tick: int = -1
 var _last_confrontation_tick: int = -1  # Deduplicate confrontation_monologue signals within same tick
 var _known_recognition_ids: Dictionary = {}  # D-067: entity_ids that have already chimed
 var _flash_rect: ColorRect = null  # #502/#501: ephemeral screen flash overlay (shared: teleport preempts amber)
-var _teleport_in_progress: bool = false  # #501: defer smoothing re-enable by one frame after teleport
+var _teleport_in_progress: bool = false  # #501/#117: forces camera snap (not lerp) on next _process frame
 var _pending_record_inputs: Array = []   # #507: accumulates server-bound inputs across frames; flushed into record_tick() on snapshot arrival
 var _current_zone: String = ""           # D-073 (#529): zone tracking for ambient crossfades
 
@@ -47,7 +47,7 @@ func _ready() -> void:
 	# Camera anchor: snap to player position before the first frame renders.
 	# In test mode poll_snapshot() returns synchronously — position is set
 	# immediately. In live mode the snapshot isn't available yet — _process
-	# handles it. No reset_smoothing() needed: smoothing is OFF.
+	# handles it via the lerp block in _process().
 	var first_snapshot: Variant = SimBridge.poll_snapshot()
 	if first_snapshot != null:
 		GameState.apply_snapshot(first_snapshot)