Star-Marshal: Raycast Tactical Shooter

Game Design & Technical Specification Prompt:

Context & Vision:
You are tasked with developing the core mechanic and technical implementation for a top-down, tactical space shooter game. The setting is a dynamic environment where the player assumes the role of a "Star-Marshal," responsible for clearing a derelict space station infested with rogue drones. The game must emphasize precise, high-speed hit-scan combat and highly dynamic, reactive lighting effects.

Core Mechanic Requirements:

1. Perspective: Strict top-down view.
2. Combat Style: Precise hit-scan weapon system.
3. Atmosphere: Dynamic lighting is crucial; the environment must respond realistically to the presence of weapons and explosions.

Technical Implementation Details (Focus Area):
Develop the implementation plan and conceptual code structure for the primary weapon firing mechanism, adhering to the following constraints:

1. Hit Detection: Implement weapon firing using the THREE.Raycaster technique for instant-hit detection against drone targets.
2. Visual Feedback (Muzzle Flash): Implement a visual muzzle flash effect that is triggered upon firing. This effect must be a transient light source that visibly flickers for exactly $0.05$ seconds immediately following the trigger event.
3. Lighting Integration: Describe how the hit-scan mechanics and the muzzle flash should dynamically interact with the existing dynamic lighting system to enhance the tactical feel of the combat.

Desired Output:
Provide a detailed, actionable technical specification and pseudocode structure outlining the implementation of the above mechanics in a Three.js environment, focusing specifically on the Raycasting and Muzzle Flash implementation.