fix(client): address PR #54 review — 7 items across Hoshe and Tyre

Critical: DIALOGUE_MAX_WIDTH 1200 → 640 to match D-076 spec.
tile_renderer: clarify z = server floor level, not scene z_index.
Add z-filter unit test (tiles at z!=0 must be skipped).
Camera test: is_equal → distance check for float safety, convergence
test frames 40 → 120 for robustness at lower smoothing speeds.
Teleport: remove redundant first snap in _teleport_transition (the
camera block in _process handles it via _teleport_in_progress flag).
entity_renderer: document y-sort bottom-anchor migration path.

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

client/scripts/rendering/tile_renderer.gd

@@ -64,8 +64,10 @@ func _setup_tileset() -> void:
 
 # Update tiles from snapshot data
 # tiles: Array of {x: int, y: int, z: int, type: String}
-# Only renders z=0 tiles (ground floor). z=1 (FloorObjects) and z>1 (upper floors)
-# are handled by separate nodes — skipped here until those layers are implemented.
+# z here is the server-side FLOOR LEVEL (0 = ground, 1 = first floor, etc.),
+# NOT the Godot scene z_index (which controls render order within a floor).
+# This node only renders floor-level 0. Higher floor levels will be handled
+# by separate TileMapLayer nodes when multi-floor rendering is implemented.
 func update_tiles(tiles: Array) -> void:
 	if not _initialized:
 		return
@@ -76,8 +78,8 @@ func update_tiles(tiles: Array) -> void:
 		if not tile_data.has("x") or not tile_data.has("y") or not tile_data.has("type"):
 			continue
 
-		# Multi-layer support: FloorTiles only renders z=0 (ground floor).
-		# z=1 → FloorObjects node, z=2 → YSortGroup furniture (future layers).
+		# Floor-level filter: only render tiles at floor level 0 (ground).
+		# Floor level 1+ tiles are for upper floors (future multi-floor nodes).
 		var tile_z: int = tile_data.get("z", 0)
 		if tile_z != 0:
 			continue