lgbot: docs (README, ADMIN, HOW-IT-WORKS, PLAYERS), back up lgbot files

Co-Authored-By: Claude Opus 5.5 <[email protected]>

docs/HOW-IT-WORKS.md

@@ -19,7 +19,15 @@ Approaches that don't work:
 
 In warmup the client draws "The match will begin when more players join" / "Press F3 to ready yourself". No cvar hides it. The client draws it only while configstring `CS_WARMUP` (index 5) holds a time (warmup sets `\time\-1`). The plugin hooks `set_configstring` and sends an empty value for index 5 instead. The server itself stays in warmup. The first map is set up before plugins load, so the plugin also clears the value once when it loads. Check: `docker logs ql-lg | grep nowarmuptext` shows `CS_WARMUP=''`.
 
-minqlx is started with only our plugins (`qlx_plugins "nowarmuptext,welcome"`). Its default plugin list needs a Redis server, which this setup doesn't run. QL's built-in `access.txt` covers admins and bans without it.
+## The training bot (`lgbot`): aim from the character file, movement from a plugin
+
+Quake 3 bots take their personality from a character file. `home/baseq3/botfiles/bots/lgbot_c.c` (registered by `scripts/lgbot.bot`) sets aim accuracy, aim skill, reaction time and view speed per skill level, sets jumping, crouching and rocket jumping to 0, and weights the LG above everything else. QL reads skill blocks 1, 4 and 5 and interpolates 2 and 3 between 1 and 4, which is why the file has only three. The server loads these loose files from `fs_homepath` alongside the ones in `pak00.pk3`, so no pk3 is needed (bots run on the server only, so clients don't need the files).
+
+The stock bot AI moves like a bot: it runs at you, hops around and goes for items. So the movement is overridden. The `lgbot` minqlx plugin sets the bot's horizontal velocity on every server frame: sideways to its target in the current strafe direction, plus an in/out part that holds the wanted distance (capped at 70% of the speed so it still strafes while closing in). The strafe direction comes from a small pattern generator: hold one side for a random time between the min and max, then switch. Sometimes it fakes instead: a 60–120 ms tap the other way, then a new hold on the same side. An upward speed of 200–320 (a jump; QL jumps at ~275) is cancelled. Falling, slopes and jump pads are left alone. The AI still aims and shoots, so aim and movement don't interfere. Measured on a test server, the plugin costs no extra CPU you could measure.
+
+minqlx gives bots Steam IDs from 90071996842377216 up. The plugin uses that to pick human targets only.
+
+minqlx is started with only our plugins (`qlx_plugins "nowarmuptext,welcome,lgbot"`). Its default plugin list needs a Redis server, which this setup doesn't run. QL's built-in `access.txt` covers admins and bans without it.
 
 ## Vampiric, measured