Fix #7852 Command Console mechs with only one crew member were applying head hit damage twice to the single pilot instead of once.

[HammerGS]

Fixes #7852

Command Console mechs with only one crew member were applying head hit damage twice to the single pilot instead of once.

Root Cause

The damageCrew() method in TWGameManager.java iterates through all crew slots based on getSlotCount(), but did not check if a slot was actually occupied. For Command Console cockpits (which have 2 slots: Pilot + Commander), when only one crew member is present, the loop would still process both slots - applying damage to the missing slot as well.

Fix

Added a check for crew.isMissing(pos) to skip empty crew slots when applying damage. This is consistent with how other crew iteration loops handle missing slots (e.g., Crew.java:932-935).

if (crew.isMissing(pos)) {
    continue;
}

Behavior

| Scenario           | Before Fix         | After Fix         |
|--------------------|--------------------|-------------------|
| Both crew present  | Both take 1 hit    | Both take 1 hit   |
| Only pilot present | Pilot takes 2 hits | Pilot takes 1 hit |

This aligns with the Command Console rules: "damage done to the cockpit location does affect both warriors" - meaning all present warriors, not empty slots.

Test Plan

- Load Command Console mech with single pilot, take head hit - verify 1 injury
- Load Command Console mech with both crew, take head hit - verify both take 1 injury
- Verify other multi-crew cockpits (Tripod, Dual) behave correctly

[Copilot]

Pull request overview

This PR fixes a bug (#7852) where Command Console mechs with a single crew member were receiving double head hit damage instead of single damage. The issue occurred because the damageCrew() method iterated through all crew slots without checking if they were actually occupied.

Key Changes:

• Added a check for missing crew slots in the damage application loop
• Ensures damage is only applied to present crew members

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[Copilot]

This fix correctly prevents damage from being applied to missing crew positions in multi-crew cockpits. However, there are no unit tests covering the damageCrew method to verify this behavior. Consider adding test cases for:

1. Command Console mech with single pilot taking head damage (should receive 1 hit)
2. Command Console mech with both crew members taking head damage (both should receive 1 hit)
3. Other multi-crew cockpits (Tripod, Dual) with missing crew members

This would ensure the fix works as intended and prevent regressions.