Phase 1 B1/B2/B4-B7: separation, poise, boss lunge, party HP scale, run-failed banner, fire anim

B1 SEPARATION: pairwise soft-collision pass INSIDE EnemyAISystem (sole
enemy-Position writer preserved; O(n^2) fine at MaxAlive<=14). Knocked/
lunging enemies keep committed motion but still push neighbours; the boss is
never pushed; enemies yield a small personal radius around players (below
melee range per review B1-1); displacement goes through the swept move so
nothing shoves through walls. SeparationMaxSpeed = live knob.

B2 POISE: the windup-cancel lived in the knockback CONTINUE branches (grunt/
charger/spitter). Threshold on the EXISTING KnockbackState.Speed channel:
light melee (6) nudges without interrupting; the finisher (10.8) and cone
(8) stagger as before. StaggerKnockbackSpeed = live knob (default 7).

B4 BOSS LUNGE: a telegraphed gap-closer on its own cooldown when the target
sits outside slam reach (repositioning - the slam stays the damage beat).
BossState.PendingAttack (server-only byte) disambiguates the shared windup
elapse (review-confirmed: naive reuse would SLAM on a lunge elapse);
LungeState.UntilTick spans windup+travel so the existing IsLunging ghost bit
replicates the tell, and the client draws a travel wedge instead of the slam
ring while it is set.

B5 PARTY HP SCALE: boss Health x(1 + 0.75/extra LIVING expedition player) at
spawn (not RunParticipant - dead-respawned members park at base). Max is a
GhostField so the bar stays truthful.

B6 RUN-FAILED BANNER: silent wipes used to land players home with zero
explanation. Client detects the (in-run)->Staging edge with a launch-cached
Charge (NEVER Returning - a 1-tick transient that precedes the bank by a
tick) and shows EXPEDITION FAILED for 6 s.

B7 FIRE ANIM: the class ability finally moves the body - a stateless window
from replicated AbilityCooldown.NextFireTick minus derived CooldownTicks
(works for predicted local + interpolated remotes, no cached edges).

456/456 EditMode; live Play smoke: launch -> 5 kills credit the room clear
through the corpse window -> boon window opens -> corpses expire clean, no
exceptions.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/_Project/Scripts/Simulation/Tuning.cs

@@ -99,6 +99,10 @@ namespace ProjectM.Simulation
         /// non-targetable corpse so the client death animation has time to read before the despawn burst.</summary>
         public const uint EnemyDeathWindowTicks = 54;
 
+        /// <summary>Phase 1 (B5): boss HP grows by this fraction of its base per LIVING expedition player beyond the
+        /// first (counted at spawn; Health.Max replicates so the bar stays truthful).</summary>
+        public const float BossHealthPerExtraPlayer = 0.75f;
+
         // ---- Expedition BOSS (a scaled Charger given a real kit by BossAISystem; server-only feel consts) ----
 
         /// <summary>Radial SLAM AoE radius (world units): a player inside this ring at wind-up elapse eats the hit
@@ -114,6 +118,16 @@ namespace ProjectM.Simulation
         /// <summary>Ticks between SLAMs in phase one (~4 s). Phase two multiplies this by BossPhase2SlamCooldownMult.</summary>
         public const uint BossSlamCooldownTicks = 240;
 
+        // Phase 1 (B4): the boss's SECOND attack - a telegraphed gap-closing LUNGE (repositioning; the slam stays
+        // the damage beat). Windup is readable (~0.6 s); travel reuses the Charger contract (committed, wall-stopped).
+        public const uint BossLungeWindupTicks = 35;
+        public const float BossLungeSpeed = 20f;
+        public const uint BossLungeDurationTicks = 22;
+        public const uint BossLungeCooldownTicks = 300;
+        /// <summary>Lunge only when the target is beyond this (else slam) and within LungeMaxRange.</summary>
+        public const float BossLungeMinRange = 7f;
+        public const float BossLungeMaxRange = 20f;
+
         /// <summary>Health fraction at/below which the boss enters phase two (faster + summons adds).</summary>
         public const float BossPhase2HealthFraction = 0.5f;