Character and movement pass

NPC characters
- Articulated rig (hips/knees, shoulders/elbows/hands) replaces rigid capsules;
  the walk cycle bends knees and elbows and flees with a longer stride.
- Layered outfits (jacket/vest/coat/dress), extended accessories and hand items
  (bag, umbrella, phone, camera, clipboard, cup), face details and five hair
  silhouettes, all deterministic per profile seed.
- Idle behaviour layers (phone, clipboard, crossed arms, look-around), breathing
  and weight shift; escalation raises hands or points, and noticed NPCs turn
  toward the guard.
- Reaction symbols above the head (!!, ?!, !, ?), door-queue offsets assigned by
  GameManager, three LOD tiers with hysteresis and a billboard impostor.
- smoke_npc_budget.gd: 16 avatars = 534 meshes, ~6.9 ms average (50 ms budget).

Player movement
- Separate accel/decel, step-up assist for kerbs and the entrance steps, and a
  forward-axis fix: W was inverted (get_axis(forward, back) is negative).
- Head bob, landing dip and precision-walk FOV, gated by persisted head-bob and
  invert-Y settings; precision chip and tick; surface-aware footsteps and a
  landing cue forwarded to AudioFeedback.
- Gamepad support (sticks, deadzone, face buttons, bumpers), a control legend
  that follows the active device, and named actions for the remaining keys.
- Key/button remapping in Settings, persisted as input_bindings and applied by
  InputBindings (mouse and gamepad axes are never removed).
- smoke_movement.gd (windowed): climbs the steps, checks precision speed, chip,
  footsteps and landing; new 11-precision-walk capture and catalogue entry.

Verification: headless 208/208, Python tooling 56/56, all 11 smokes pass,
compare 11 good / 0 bad, movement judge match. Version 0.5.0. Only optional
Future ideas remain in TODO.

src/test/tests/test_persistence.gd

@@ -43,11 +43,45 @@ func test_settings_round_trip() -> bool:
 	save.free()
 	return a and b and c
 
+func test_camera_settings_round_trip() -> bool:
+	var save := _save_instance()
+	var err: int = save.save_settings({
+		"look_sensitivity": 0.0028, "hud_font_scale": 1.0,
+		"invert_y": true, "head_bob": false,
+	})
+	var a := TestUtils.check_eq(err, OK, "camera settings save")
+	var loaded: Dictionary = save.load_settings()
+	var b := TestUtils.check_eq(bool(loaded.get("invert_y", false)), true,
+		"invert_y survives the round trip")
+	var c := TestUtils.check_eq(bool(loaded.get("head_bob", true)), false,
+		"head_bob survives the round trip")
+	save.save_settings(save.DEFAULT_SETTINGS)
+	save.free()
+	return a and b and c
+
+func test_input_bindings_round_trip() -> bool:
+	var save := _save_instance()
+	var bindings := {"inspect": {"type": "key", "code": int(KEY_Z)}}
+	var err: int = save.save_settings({"input_bindings": bindings})
+	var a := TestUtils.check_eq(err, OK, "bindings save")
+	var loaded: Dictionary = save.load_settings()
+	var stored: Dictionary = loaded.get("input_bindings", {})
+	var inspect: Dictionary = stored.get("inspect", {})
+	var b := TestUtils.check_eq(int(inspect.get("code", 0)), int(KEY_Z),
+		"bindings survive the settings round trip")
+	var c := TestUtils.check_eq(str(inspect.get("type", "")), "key",
+		"binding type survives the settings round trip")
+	save.save_settings(save.DEFAULT_SETTINGS)
+	save.free()
+	return a and b and c
+
 func test_settings_defaults_present() -> bool:
 	var save := _save_instance()
 	var defaults: Dictionary = save.load_settings()
 	var ok := TestUtils.check(
-		defaults.has("look_sensitivity") and defaults.has("hud_font_scale"),
+		defaults.has("look_sensitivity") and defaults.has("hud_font_scale")
+			and defaults.has("invert_y") and defaults.has("head_bob")
+			and defaults.has("input_bindings"),
 		"settings have documented defaults")
 	save.free()
 	return ok