KB: land the EXPERIENCE-LEVELS decode from glass-cockpit (Cyd)

Brings Cyd's experience-level / simulation-mode research onto master (the
KB-decode portion of glass-cockpit 4e01e83; the bundled BT410 source
manifest is left for the full glass-cockpit merge).

- context/experience-levels.md (NEW): the egg per-pilot 'experience' field
  (novice/standard/veteran/expert) is the pod's SIMULATION-FIDELITY tier,
  decoded end-to-end. FUN_004c0bc8 reads btMission->experienceLevel(+0xe4)
  and fans it into the +0x25c/+0x260/+0x26c/+0x270/+0x274 flag block:
  +0x25c 'sim live' (novice lockout: jams/searchlight/powersub), +0x260 the
  HEAT-MODEL master switch (veteran+expert; FUN_004ad7d4), +0x274 raw level
  (FUN_004ac9c8 = ==0 novice predicate; the valve/advanced-cockpit lockout).
  4.0->4.10 drift: the viewscreen hunting-aid gate is GONE in 4.10 (HUD reads
  none of these flags), and movement heat is veteran+expert not expert-only.
- btplayer.cpp/.hpp: CORRECTED comments/labels -- the +0x25c..+0x274 block is
  seeded from btMission experienceLevel/advancedDamageOn, NOT the scenario
  role's returnFromDeath; the 'roleClassIndex/showKills' names are scoring-era
  mislabels. Code logic UNCHANGED (comment-only): the ctor still reads
  scenarioRole (STAND-IN, defaults 2 = veteran) pending the wiring task.
- Corrections swept into gauges-hud.md (ROOKIE->novice lockout),
  open-questions.md (player+0x260/0x274 semantics now PINNED),
  pod-hardware.md, subsystems.md, decomp-reference.md; CLAUDE.md router row.

No code-logic change -> no rebuild needed (comment + markdown only). The
runtime wiring (seed from BTMission::ExperienceLevel()) remains TODO.

Co-Authored-By: Cyd <cyd@falloutshelterarcade.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

context/decomp-reference.md

@@ -113,7 +113,7 @@ valid for reading the decomp, NOT for our compiled layout (see [[reconstruction-
 |---|---|---|
 | +0x11c / +0x120 | `damageZoneCount` / `damageZones[]` | inherited Entity; Mech ctor populates the array |
 | +0x124 / +0x128 | `subsystemCount` / `subsystemArray[]` | the [[subsystem-roster]] (NOT the segment table) |
-| +0x190 | **owning `BTPlayer`** (`GetPlayerLink()`) | set by `FUN_0049f624` (mech↔player bind; also `player->playerVehicle(+0x1fc)=mech`). The valve guard (`FUN_004ac9c8 →player+0x274`) + Myomers gate (`FUN_004ad7d4 →player+0x260`) read the owning player's game-mode flags (NOT the messmgr @0x434). `MECH_OWNING_PLAYER`. |
+| +0x190 | **owning `BTPlayer`** (`GetPlayerLink()`) | set by `FUN_0049f624` (mech↔player bind; also `player->playerVehicle(+0x1fc)=mech`). The valve guard (`FUN_004ac9c8 →player+0x274` = novice lockout) + heat-model gate (`FUN_004ad7d4 →player+0x260` = veteran/expert) read the owning player's EXPERIENCE flags — see [[experience-levels]] + the BTPlayer flag block below. `MECH_OWNING_PLAYER`. |
 | +0x434 (word 0x10d) | `SubsystemMessageManager` cache | the 0xBD3 damage/explosion hub (factory @10142). ✅ task #7 (`afefaee`): `mech.hpp` names this `messageManager`; the `controlsMapper` mislabel is swept — the real mapper is roster slot 0. |
 | +0x260 / +0x26c | `localOrigin` = { Point3D linearPosition; Quaternion angularPosition } | ORIGIN.h:15; position@+0x100 in some subsystem views |
 | +0x300 | segment table | skeleton `EntitySegment`s (muzzle sites, joints) |
@@ -128,6 +128,20 @@ valid for reading the decomp, NOT for our compiled layout (see [[reconstruction-
 
 `mech+0x100` (a subsystem-view of localOrigin.linearPosition): `.x@+0x100, .z@+0x108`. [T1]
 
+### BTPlayer (0x294) experience/game-mode flag block (ctor @4c0bc8; see [[experience-levels]]) [T1]
+
+Seeded on the master branch from `btMission(+0x1f8)->experienceLevel(+0xe4)` (egg `experience`,
+parse @4d2f3e → `BTMission+0xe4`) and `advancedDamageOn(+0xf0)`:
+
+| Offset | Value by level (nov/std/vet/exp) | Verified readers |
+|---|---|---|
+| +0x25c | 0/1/1/1 — "sim live" (novice lockout) | jam roll @4bbfcc, searchlight ToggleLamp @4b860c, powersub handler @4b0efc, mech-ineffective eval part_012.c:9364 |
+| +0x260 | 0/0/1/1 — **heat-model master switch** | `FUN_004ad7d4` → Myomers @4b8d18, Emitter, heat.cpp, mislanch, projweap heat |
+| +0x264/+0x268 | = mission `advancedDamageOn` (both) | heat-family sim part_013.c:8757 |
+| +0x26c | 0/1/1/0 | none located (supercharge-clamp hypothesis [T4]) |
+| +0x270 | 0/1/1/1 | none located |
+| +0x274 | raw level 0..3 | `FUN_004ac9c8` = (==0) novice predicate (valve guard), powersub @4b21d0 |
+
 ### Binary ATTRIBUTE TABLES (2026-07-16, walked from the image) [T1]
 
 **Row format: 16-byte `{id, namePtr, memberOffset+1, 0}`** (MIND THE ALIGNMENT — an 8-off walk