feat: Shot spillover; Speed force; scr_shoot refactor

[EttyKitty]

Summary by cubic

Adds shot spillover across enemy ranks/formations and the Speed Force sweep, consolidating volleys for clearer combat. Refactors shooting into dedicated player/enemy paths, adds obstruction-aware targeting, and tunes starting formation weights.

• New Features

  • Shot spillover: excess shots roll to the next alive rank (prefers same vehicle type), then the nearest formation; cleans up with find_next_alive_rank, get_next_enemy_formation, and combat_cleanup_formations.
  • Speed Force: scr_shoot_spread sweeps all enemy formations, allocates shots by rank size, and reports one volley; auto-added to bike stacks with an optional ranged variant.
  • Targeting obstruction: check_column_obstruction for player/enemy back-row targeting; fixes pass-through and flanking offset.
  • Shooting refactor: scr_shoot split into scr_shoot_player/scr_shoot_enemy; adds combat_rank_armour and combat_apply_rank_damage; expanded CombatDebugger logs.
  • Balance: updated starting formation weights (e.g., Tacticals 3, Terminators 4, Rhinos/Predators/Land Raiders 5).

• Bug Fixes

  • Correct armour/AP handling for infantry and vehicles in scr_clean via combat_rank_armour; Heretics keep their damage boost; legacy emplacements fire reliably.

^{Written for commit 6fcc9c7. Summary will update on new commits.}

[cubic-dev-ai]

All reported issues were addressed across 3 files

Confidence score: 5/5

• Safe to merge after the addressed issues were fixed.

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[cubic-dev-ai]

2 issues found across 1 file (changes from recent commits).

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

_{Re-trigger cubic}

[github-actions]

This PR is marked as stale, because it has been open for 7 days with no activity.