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/main.gd

@@ -425,10 +425,8 @@ func _detect_teleport(old_pos: Vector2, new_pos: Vector2) -> bool:
 # Clears dialogue/monologue/interaction state (server clears its side too).
 # Scoped to Gauntlet testing only — production fast-travel uses diegetic gates.
 func _teleport_transition() -> void:
-	# Snap camera immediately to new position. _teleport_in_progress causes
-	# the lerp block in _process() to snap again on the same frame (in case
-	# player_position updates after this call) and skip lerp next frame.
-	camera.global_position = GameState.player_position * Constants.TILE_SIZE
+	# Set teleport flag — the camera tracking block in _process() will snap
+	# to the player's new position this frame (no lerp). Flag clears after snap.
 	_camera_anchored = true
 	_teleport_in_progress = true