Add fixed core HUD and shared service window for T5 and T6

t5/scripts/NOTES.md

@@ -32,9 +32,11 @@ before copying the renamed scripts.
 - **`SetTimerUp(N)` only ticks when `N == 0`** on T5 SP. Non-zero seeds
   render "0:00" but don't advance. Late joiners see 0, not real elapsed;
   authoritative elapsed lives in `level.match_start_time`.
-- **Dynamic text: use `SetValue`, not `SetText`.** `SetText` allocates a
-  config string per call; per-tick rebuilds overflow and take the server
-  down. Composite strings like `"87/160"` are three elements.
+- **Dynamic numbers use `SetValue`.** Repeatedly generating unique strings
+  risks exhausting the text config-string pool; identical strings can be reused
+  by the engine's [string lookup](https://github.com/MisaDev4/bo1-zombies-decompiled/blob/102f6992be332610aff587e681e3180b15f395bb/src/game_mp/g_utils_mp.cpp#L46).
+  Composite HP uses numeric elements around a static slash. Help updates two
+  multiline columns only on page changes, and record rows skip unchanged text.
 - **`NewClientHudElem(player)`, not `NewHudElem()`.** `NewHudElem` is
   globally owned; in co-op every player's HUD draws on top of every other
   player's. Fall back to `NewHudElem` only if elements don't render at all
@@ -56,18 +58,40 @@ before copying the renamed scripts.
   Many BO1 maps pre-set `round_number = 1` at init, so the round watcher
   fires on transitions only and the timer row seeds on first spawn as a
   fallback.
+- **Connection-time HUD creation must not seed clocks.** The upper-right core
+  is available to waiting spectators with placeholders. Timer updates retain
+  their existing spawn/round lifecycle, independently of element creation.
+- **One service window per player.** Common owns fixed geometry, ordered
+  four-command help pages, record display state and cleanup. Help pauses record
+  page time; `.leaders` during help replaces the pending replay from page one.
+  Keep both services independent of the HUD module. The core never moves or
+  resizes when a service opens, and the AFK indicator uses its reserved footer.
+- **Bound HUD element counts, including hidden elements.** Core + AFK use
+  15 + 1 archived elements; the service uses 19 nonarchived elements regardless
+  of command/page count. Help reuses two multiline columns and one muted column
+  backdrop. Hiding an element does not free its slot. The
+  [BO1 HUD update](https://github.com/MisaDev4/bo1-zombies-decompiled/blob/102f6992be332610aff587e681e3180b15f395bb/src/game/g_hudelem.cpp#L2596)
+  shows 31 slots per bucket; this is not proof of current Plutonium stock HUD
+  usage, which still needs live validation.
 - **Game-over trigger is level-scope, raced across three candidate
   notifies** (`end_game` / `game_ended` / `intermission`) since BO1 maps
   are inconsistent. Per-player triggers do not work — `self waittill("death")`
   is intercepted by the zombiemode scripts before it reaches our scope, and
   polling `self.health` misses the zero-crossing (health is rewritten during
   the game-over sequence).
+
+HUD `1.2.0`, leaderboard `1.1.0` and AFK `1.0.1` require matching common `1.2.0+`.
+Install the changed scripts together and restart the map. There is no new
+native-plugin/backend dependency or full server-process restart requirement.
+Run the [shared HUD checks](../../README.md#hud-validation); portable fixtures
+do not replace T5 live loading, layout and lifecycle validation.
+
 ## Module map
 
 | File | Role | Fires notifies | Reads notifies |
 |---|---|---|---|
-| `tws_t5_common` | Shared config, HUD helpers, `.help` registry, spawn-handler registry, single connect listener + dispatcher | — | `say` |
-| `tws_t5_hud`    | Timer row, zombie count, health bar | `hud_round_changed`, `hud_match_started`, `hud_game_over` | (internal) |
+| `tws_t5_common` | Shared config, HUD helpers, paginated `.help`, service window, spawn-handler registry, single connect listener + dispatcher | — | `say`, game-end notifications |
+| `tws_t5_hud`    | Upper-right core: branding, timer row, zombie count, HP and health bar | `hud_round_changed`, `hud_match_started`, `hud_game_over` | (internal) |
 | `tws_t5_afk`    | `.afk` / `.back` chat toggle, owns its [AFK] indicator | — | — |
 | `tws_t5_join`   | `.join` for spectators who have not played on this connection | — | `say`, `end_game`, `game_ended`, `intermission` |
 | `tws_t5_lock`   | Lobby `g_password` lock at milestone round (`tws_lock_round`, default 20) | — | `hud_round_changed`, `hud_game_over` |