Integrate Kenney Starter Kit FPS assets + comprehensive test suite

Assets (CC0 license):
- 3D models: Blaster gun, walls, platforms, grass, clouds, enemy
- Sounds: blaster fire, impacts, footsteps, jumps, weapon change
- Sprites: crosshair, hit marker, muzzle flash, skybox, blob shadow
- Font: Lilita One

Code changes:
- weapon_manager.gd: load blaster.glb as gun model (replaces box mesh)
- player.tscn: use Kenney sounds (blaster.ogg, enemy_hurt/destroy) and crosshair

Test suite (100 unit tests + 4 integration scenarios):
- weapon_data.gd: 27 tests — all 6 weapons every stat verified
- economy.gd: 19 tests — constants, loss streak, buy thresholds
- bomb.gd: 15 tests — state machine, timing constants
- round_manager.gd: 10 tests — win conditions, elimination logic
- team_manager.gd: 8 tests — auto-balance, team assignment
- headless_test_bot.gd: integration bot with movement/idle/rounds scenarios
- run_multi_bot.sh: multi-client launcher

assets/kenney-fps/sounds/blaster.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://dkftljsbdhwng"
+path="res://.godot/imported/blaster.ogg-1527ec84d518b60bb9fbaad97656d870.oggvorbisstr"
+
+[deps]
+
+source_file="res://sounds/blaster.ogg"
+dest_files=["res://.godot/imported/blaster.ogg-1527ec84d518b60bb9fbaad97656d870.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/kenney-fps/sounds/blaster_repeater.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://csdsvg0nh35id"
+path="res://.godot/imported/blaster_repeater.ogg-a46ceca73f68a6e3e41e971b07cb8de8.oggvorbisstr"
+
+[deps]
+
+source_file="res://sounds/blaster_repeater.ogg"
+dest_files=["res://.godot/imported/blaster_repeater.ogg-a46ceca73f68a6e3e41e971b07cb8de8.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/kenney-fps/sounds/enemy_attack.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://blxqudiclpq84"
+path="res://.godot/imported/enemy_attack.ogg-ad3c73e6e91698e3fc81bd6423d8fca2.oggvorbisstr"
+
+[deps]
+
+source_file="res://sounds/enemy_attack.ogg"
+dest_files=["res://.godot/imported/enemy_attack.ogg-ad3c73e6e91698e3fc81bd6423d8fca2.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/kenney-fps/sounds/enemy_destroy.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://br1ov3ld0er6r"
+path="res://.godot/imported/enemy_destroy.ogg-feb8f111abab93d5fc30ec838c975232.oggvorbisstr"
+
+[deps]
+
+source_file="res://sounds/enemy_destroy.ogg"
+dest_files=["res://.godot/imported/enemy_destroy.ogg-feb8f111abab93d5fc30ec838c975232.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/kenney-fps/sounds/enemy_hurt.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://cgnbyrnxj12ed"
+path="res://.godot/imported/enemy_hurt.ogg-64e07bfa21b7ae57b8a0bf7357a95008.oggvorbisstr"
+
+[deps]
+
+source_file="res://sounds/enemy_hurt.ogg"
+dest_files=["res://.godot/imported/enemy_hurt.ogg-64e07bfa21b7ae57b8a0bf7357a95008.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/kenney-fps/sounds/jump_a.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://bvnum0u73y8sv"
+path="res://.godot/imported/jump_a.ogg-df3a87b422b8537163b811137ab76d0c.oggvorbisstr"
+
+[deps]
+
+source_file="res://sounds/jump_a.ogg"
+dest_files=["res://.godot/imported/jump_a.ogg-df3a87b422b8537163b811137ab76d0c.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/kenney-fps/sounds/jump_b.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://5raj3p7xaecq"
+path="res://.godot/imported/jump_b.ogg-f0989d7351debef348a67b21be8b7bd0.oggvorbisstr"
+
+[deps]
+
+source_file="res://sounds/jump_b.ogg"
+dest_files=["res://.godot/imported/jump_b.ogg-f0989d7351debef348a67b21be8b7bd0.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/kenney-fps/sounds/jump_c.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://7tnsakv8pwa5"
+path="res://.godot/imported/jump_c.ogg-6a4808f519ad4af845e78fe92b3da78c.oggvorbisstr"
+
+[deps]
+
+source_file="res://sounds/jump_c.ogg"
+dest_files=["res://.godot/imported/jump_c.ogg-6a4808f519ad4af845e78fe92b3da78c.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/kenney-fps/sounds/land.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://xnxidwkp46un"
+path="res://.godot/imported/land.ogg-7222ba872273a4a7535937ef5cfdffd0.oggvorbisstr"
+
+[deps]
+
+source_file="res://sounds/land.ogg"
+dest_files=["res://.godot/imported/land.ogg-7222ba872273a4a7535937ef5cfdffd0.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/kenney-fps/sounds/walking.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://cydjn1ct3hps2"
+path="res://.godot/imported/walking.ogg-bf61e9916135189ff0d5c06a148b02ab.oggvorbisstr"
+
+[deps]
+
+source_file="res://sounds/walking.ogg"
+dest_files=["res://.godot/imported/walking.ogg-bf61e9916135189ff0d5c06a148b02ab.oggvorbisstr"]
+
+[params]
+
+loop=true
+loop_offset=0.0
+bpm=0.0
+beat_count=0
+bar_beats=4

assets/kenney-fps/sounds/weapon_change.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://cmc2ufr6o30gl"
+path="res://.godot/imported/weapon_change.ogg-7ebfd5dcd3026b79e24db351d30b1a1b.oggvorbisstr"
+
+[deps]
+
+source_file="res://sounds/weapon_change.ogg"
+dest_files=["res://.godot/imported/weapon_change.ogg-7ebfd5dcd3026b79e24db351d30b1a1b.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4