gmp(M02): gate debug movement capabilities

Work-Package: M02-GMP-SANDBOX-CAPABILITIES-001

Agent: sindo-main-codex

Tests: capability/input/movement/terrain/camera/presentation; coordinate/streaming/docs/coordination; renderer dry-run 7/7

Fidelity: proves debug sprint/free-flight exclusion in Blizzlike335; no positive movement parity claim

src/gameplay/movement/player_movement_capabilities.gd

@@ -0,0 +1,53 @@
+class_name PlayerMovementCapabilities
+extends RefCounted
+
+## Immutable local-player movement capability selection.
+## Unknown or missing profile identifiers collapse to the safe Blizzlike335
+## capability set; only RenderSandbox enables debug sprint and free flight.
+
+const BLIZZLIKE_335_PROFILE_ID: StringName = &"Blizzlike335"
+const RENDER_SANDBOX_PROFILE_ID: StringName = &"RenderSandbox"
+
+var profile_id: StringName:
+	get:
+		return _profile_id
+
+var allows_debug_sprint: bool:
+	get:
+		return _allows_debug_sprint
+
+var allows_debug_free_flight: bool:
+	get:
+		return _allows_debug_free_flight
+
+var _profile_id: StringName
+var _allows_debug_sprint: bool
+var _allows_debug_free_flight: bool
+
+
+func _init(requested_profile_id: StringName = BLIZZLIKE_335_PROFILE_ID) -> void:
+	if requested_profile_id == RENDER_SANDBOX_PROFILE_ID:
+		_profile_id = RENDER_SANDBOX_PROFILE_ID
+		_allows_debug_sprint = true
+		_allows_debug_free_flight = true
+		return
+	_profile_id = BLIZZLIKE_335_PROFILE_ID
+	_allows_debug_sprint = false
+	_allows_debug_free_flight = false
+
+
+## Returns the debug-enabled capability set used by current renderer scenes.
+static func render_sandbox() -> PlayerMovementCapabilities:
+	return PlayerMovementCapabilities.new(RENDER_SANDBOX_PROFILE_ID)
+
+
+## Returns the compatibility-safe capability set with debug movement disabled.
+## This name identifies the intended compatibility profile, not proven 1:1 movement.
+static func blizzlike_335() -> PlayerMovementCapabilities:
+	return PlayerMovementCapabilities.new(BLIZZLIKE_335_PROFILE_ID)
+
+
+## Maps scene/application profile configuration to a known capability set.
+## Unknown identifiers fail closed to Blizzlike335.
+static func for_profile_id(requested_profile_id: StringName) -> PlayerMovementCapabilities:
+	return PlayerMovementCapabilities.new(requested_profile_id)