[M1.5][Codex] Integrate Art V2 character and combat animations

[BotTony329]

Summary

• replace normal-game placeholder actor visuals with Art V2 for the player, melee ghost, Ghost Archer, Ghost Arrow, and Gate Warden
• synchronize player/melee/Boss hitboxes and Archer release with authored animation frames while retaining the existing Hitbox/Hurtbox/CombatResolver pipeline
• add slash, confirmed-hit, death effects and matching V2 HUD/sacrifice icons
• preserve debug collision visibility behind F8 and route F4 Ghost Archer spawning through the existing coordinator composition seam
• add a complete asset audit and 640×360 visual validation screenshots under assets_v2/review/

Frame synchronization

• player light attack 1: startup 0–3, active 4–5, recovery 6–7
• melee ghost: startup 0–3, active 4–5, recovery 6–7
• Ghost Archer: aim reaches frame 5; arrow releases once on shoot frame 1
• Gate Warden attack 1: startup 0–3, active 4–5, recovery 6–9
• player defeat UI and Boss victory presentation wait for the authored death strip

Validation

• godot --headless --import
• godot --headless --path . res://tests/test_runner.tscn
• 66 tests / 421 assertions / 0 failures locally (Godot 4.7.1)
• 180-frame headless main-scene smoke run with no errors
• rendered visual evidence for idle, run, jump, active player hitbox, Archer aim/arrow, and Boss attack/death

Architecture

No frozen framework interface was changed. RunState, CombatResolver, damage types, integrity/sacrifice services, EventBus, RNG, RunCoordinator, EnemyBase, the player controller/state-machine foundation, and Hitbox/Hurtbox remain intact.

Known limitations

• player light attack 2/heavy and Gate Warden attack 2 are imported because their supplied SpriteFrames resources reference them, but remain unmapped because gameplay does not support those actions
• Corpse Beast remains reserved for X03
• Ghost Arrow retains its old polygon only as a hidden emergency load-failure fallback
• interactive macOS control and MP4 conversion were unavailable; screenshots are provided instead

See docs/ART_V2_INTEGRATION_REPORT.md and docs/AI_HANDOFF.md for the full handoff.