KB sweep: env-gate hub table catches up (BT_RELAY/BT_SELF/BT_KEY_STOP/...); stale MP remaining-work line updated; gauges-hud callsign cross-ref

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

context/decomp-reference.md

@@ -258,6 +258,15 @@ default-ON (`'0'` disables).
 | `BT_MP_LOG` / `BT_MP_NET` / `BT_MP_FORCE_DMG` | MP diagnostics / forced cross-pod damage |
 | `BT_AUTODRIVE=<0..1>` | headless throttle |
 | `BT_KEY_NOFOCUS=1` | accept key input without window focus |
+| `BT_KEY_STOP=1` | enable the dev stop-mission keystroke `'&'` (Shift+7) — OFF by default since the tester crash report (APP.cpp; [[reconstruction-gotchas]]) |
+| `BT_KEY_LOG` | `[keych]` keyboard-event delivery trace (btl4mppr.cpp) |
+| `BT_RADAR_LOG` | radar ctor probe + 1 Hz `[radar-wedge]` torso-twist rot trace ([[gauges-hud]]) |
+| `BT_SPAWN_AT="x z"` | override the spawn position (mech.cpp — MP test rigs) |
+| `BT_RXJIT` | inbound update-record inter-arrival jitter histogram (mech4.cpp — the single-box affinity artifact) |
+| `BT_SLIDE` | locomotion slide diag (mech.cpp) |
+| `BT_RELAY=<host:port\|auto>` | **D1 relay mode** — dial the relay/operator console instead of the P2P mesh; `auto` = LAN UDP-broadcast discovery on udp/15999 ([[multiplayer]] D1) |
+| `BT_SELF=<[pilots] tag>` | claim a specific roster seat in relay mode; absent/`auto` = the relay assigns one (SEAT_REQUEST) |
+| `BT_RELAY_TCP_ONLY=1` | disable the relay UDP channel (all unreliable traffic rides the TCP relay conn) |
 
 Full render/locomotion gates (BT_RAMP, BT_MATPRI, BT_CULL, BT_SHADOW_*, BT_LODSEL, BT_ADDLOD,
 BT_PUNCH, …) are catalogued in [[rendering]]. Warp visuals: [[translocation-warp]].

context/gauges-hud.md

@@ -225,6 +225,10 @@ This recovery also CONFIRMS the HUD attr-table ids 4/5/6/8/0xA/0xB/0xC/0xD name
 (hud.hpp had flagged them uncertain). Deferred: PNAME1-8.bgf 3D marker chain. (The canopy shell
 is now authentic and shows by default — see [[cockpit-view]]; `BT_HIDE_COCKPIT=1` hides it.)
 
+Player CALLSIGN labels (kill/damage feed, radar/target tags, score display) are 1bpp name
+BITMAPS from the egg, not text — format, renderers, and the operator-console generator:
+[[multiplayer]] §OPERATOR-SET CALLSIGNS.
+
 ## Key Relationships
 - Full history: `docs/GAUGE_COMPOSITE.md`; reticle recovery: `phases/phase-02-dpl2d-reticle.md`.
 - Uses: [[attribute-pointer]] + [[reconstruction-gotchas]]; reads [[subsystems]] state.

context/open-questions.md

@@ -621,8 +621,10 @@ register.  ⚠ The audit also flags the damage-economy item as SELF-CONTRADICTOR
   [T3]: stream the model's UpdatePositionDiffrence/TurnVelocity/TurnDegree deadband constants
   to the senders (stand-in thresholds meanwhile).
 - The WinSock2 stack (L4NET.CPP) is 2-node verified end-to-end (cross-pod kills, beams,
-  replicant gait — tasks #46-#51); remaining = the real pod-LAN config (real IPs, bare-IP
-  pilot entries).
+  replicant gait — tasks #46-#51). Real-IP pod-LAN config VALIDATED 2026-07-15; **D1 relay mode
+  + UDP channel + LAN discovery + relay-assigned seats + operator console shipped 2026-07-18**
+  (see [[multiplayer]] D1). Remaining (config, not code): an actual two-physical-machine
+  internet session through the relay (ports verified open; `players/join.bat` ready).
 - **✅ Subsystem-record replication IS wired — the AC just wasn't using it (task #61,
   2026-07-13) [T2, CORRECTED].** (An earlier draft of this note WRONGLY claimed "no
   subsystem-record channel" — that was concluded from an AC-only test before the AC's