Add modular chat help for T5 and T6

t6/NOTES.md

@@ -23,6 +23,16 @@ HUD again owns the `hud_game_over` notification fan-out. Lock again waits on HUD
 notifications, applies T5's random password, and clears it on startup/game over.
 The added password-preservation dvars and independent lock watcher are gone.
 
+Common also listens for `.help` through the native `say` notification, independent
+of first-spawn initialization so newcomers can view commands while spectating.
+Each loaded command module registers its command and description with
+`register_help_command()` during `init()`. Lazy registry initialization preserves
+registrations regardless of module initialization order. Help uses client HUD
+elements below the health bar, sharing the HUD's anchors to avoid overlap with
+timers, zombie count and health numbers. Text is created once per connection and
+reused; each request restarts a 12-second visibility timer. Disconnect cleanup
+is independent of that timer. The command handlers retain their existing listeners.
+
 AFK again listens to the native `say` notification, so it no longer needs plugin
 chat registration. The additional T6 controls are only held while AFK; `.back`
 releases them before the protection grace period. Restoration is deferred during
@@ -82,9 +92,10 @@ at link time. The other four TWS modules can run without telemetry.
 
 ## Checks
 
-Local: all five files pass gsc-tool 1.4.10 T6 PC compilation; shared references and
-entry points are checked by `tools/check.ps1`. No live server was run for this
-baseline simplification. Compiler success does not certify runtime linking.
+Local: `tools/check.ps1` compiles all six files for T6 PC and checks shared
+references and entry points. It requires PowerShell and gsc-tool. The `.help`
+change passed the static entry-point/reference checks, but compilation and live
+gameplay were not run. Compiler success does not certify runtime linking.
 
 Live checks after deploying:
 
@@ -97,3 +108,12 @@ Live checks after deploying:
 4. Telemetry sends the initial occupied round and each new round to the existing
    endpoint. Check server ID/player count, same-round joins and an unreachable API.
 5. Repeat on the actual server maps, especially afterlife and special-enemy rounds.
+6. Type `.help` and `.HELP` before first spawn, during play and while AFK: see
+   `.help`, `.afk`, `.back` and `.join` with descriptions, only on the requesting
+   player's screen below the health bar. Take damage so health numbers appear
+   and verify they do not overlap help. Repeat the command before 12 seconds
+   elapse: one list should remain visible until 12 seconds after the latest
+   request. Reopen after expiry and reconnect; verify no duplicates or leftovers.
+   Remove the AFK or Join module, restart the map and confirm its commands are
+   absent. Restore the modules and confirm `.afk`, `.back` and `.join` still
+   behave as before.