Spawn spectators with no health so scripts stop counting them alive

spawn() rebuilt the player state with full health for every session state,
and map_restart respawns every client as a spectator, so a dead player, or
a bot that joined mid-round and had not spawned yet, held 100 health.
isAlive() is health above 0, so the scripts counted them alive. At a Search
and Destroy round end the stock _matchdata logging then ran logPlayerLife
on bots added mid-round, which have no spawn fields, and logged 39 script
errors. Sentry turrets also took spectators as live targets.

MW2's spawnPlayer sets self.health = self.maxhealth itself before it calls
spawn(), and spawnSpectator, spawnIntermission and spawnEndOfGame never
touch health. So now only a "playing" spawn fills health to max. A
spectator holds 0, and "dead" and "intermission" keep the health the
client had.

Checked on a Mac with our build (S&D on mp_brecourt, 4 bots, 5 more added
20 s into round 1, then the human dies): before, every spectator held 100
health and the round-1 end logged the _matchdata errors. After, the
spectators held 0, rounds 2, 3 and 4 each started with all 10 players
alive at full health, and no _matchdata error was logged. The IW4L port is
compile-checked only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/sim/src/script_player.rs

@@ -49,6 +49,7 @@ pub(crate) fn spawn(
     };
     world.unlink_player_area(id);
     world.client_meta_mut(id).shield = None;
+    let prev_health = world.player(id).map(|p| p.health);
     let mut ps = spawn_player_state(origin, angles);
     if let Some(max) = world
         .client_meta(id)
@@ -56,8 +57,12 @@ pub(crate) fn spawn(
         .filter(|&n| n > 0)
     {
         ps.max_health = max;
-        ps.health = max;
     }
+    ps.health = match sessionstate {
+        "playing" => ps.max_health,
+        "dead" | "intermission" => prev_health.unwrap_or(0),
+        _ => 0,
+    };
     let cmd = spawn_command_angles(world, id);
     ps.delta_angles = std::array::from_fn(|axis| angles[axis] - cmd[axis] as f32 * SHORT2ANGLE);
     let prev_teleport = world