fix(client): address PR #36 review — 10 items from Hoshe + Tyre

Critical:
- deactivate_insert() now called when selecting non-Insert spoke,
  cancelling with no selection, or pressing Escape while insert is
  active. Fixes simulation staying paused permanently after Insert.

Warnings:
- Checklist conditions with empty id excluded from get_results() and
  get_total_count() — prevents impossible-to-complete checklists.
  Warns at load time when empty-id conditions are found.
- _content_base now checks res://content/ first (exported builds),
  falls back to ../content for editor/dev mode.
- 26 new tests for D-054 functions: _angle_to_octant (8 octants),
  _snap_to_octant_dir (9 cases incl. zero/tiny), _wasd_to_world_dir
  (8 facing/movement combos). New test file: test_input_mapper_facing.gd.

Suggestions:
- Cached get_theme_default_font() in checklist overlay _ready().
- Documented InputMapper → GameState coupling as intentional.
- Documented YAML parser # truncation limitation.
- _insert_active reset on Escape dismiss (Tyre #3).
- SimBridge test mode SetFacing reads action_data.facing instead of
  InputMapper global (Tyre #4).
- Removed dead _facing_to_rotation() from entity_renderer.gd (Tyre #5).
- Fixed 2 failing facing indicator tests to use InputMapper.facing_angle
  instead of GameState.player_facing.

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

client/ui/checklist_overlay.gd

@@ -20,12 +20,14 @@ const MAX_DESC_CHARS := 52  # Truncate long descriptions
 
 var _evaluator = null  # ChecklistEvaluator instance
 var _last_room_id: Variant = null
+var _cached_font: Font = null  # Cached to avoid per-frame theme lookup
 
 
 func _ready() -> void:
 	mouse_filter = Control.MOUSE_FILTER_IGNORE
 	visible = false
 	_evaluator = _ChecklistEvaluator.new()
+	_cached_font = get_theme_default_font()
 
 
 func update_from_state() -> void:
@@ -59,7 +61,7 @@ func _draw() -> void:
 	if _evaluator == null or not _evaluator.is_loaded():
 		return
 
-	var font := get_theme_default_font()
+	var font: Font = _cached_font if _cached_font else get_theme_default_font()
 	var results: Array = _evaluator.get_results()
 	if results.is_empty():
 		return

client/ui/world_radial.gd

@@ -4,7 +4,9 @@ extends Control
 ## Insert-styled: geometric lines, thin spokes, nearly transparent.
 ## Renders on InsertOverlay (CanvasLayer 10).
 ## Drag-release for power users, click-click for newcomers.
-## Insert spoke sends Pause on activate, Pause again on close (toggle).
+## Insert spoke sends PauseSimulation on activate (#518/D-058).
+## Selecting any other spoke (or re-opening the radial) calls deactivate_insert()
+## which sends ResumeSimulation. Pause/resume are idempotent.
 
 signal spoke_selected(spoke_name: String)
 
@@ -83,6 +85,15 @@ func _close_menu() -> void:
 	visible = false
 
 
+# Handle Escape key to dismiss menu and deactivate insert if active.
+func _unhandled_input(event: InputEvent) -> void:
+	if _open and event.is_action_pressed("ui_cancel"):
+		if _insert_active:
+			deactivate_insert()
+		_close_menu()
+		get_viewport().set_input_as_handled()
+
+
 func _update_hover(mouse_pos: Vector2) -> void:
 	var delta := mouse_pos - _origin
 	var dist := delta.length()
@@ -115,6 +126,13 @@ func _confirm_selection() -> void:
 
 		if _hovered_spoke == Spoke.INSERT:
 			_activate_insert()
+		elif _insert_active:
+			# Selecting any non-Insert spoke closes the insert and resumes sim
+			deactivate_insert()
+
+	elif _insert_active:
+		# No spoke selected (cancelled) while insert active — close insert
+		deactivate_insert()
 
 	_close_menu()