sweep the knowledge base up to this session: log day, crash symbolization, a misnamed accessor

Audit of what actually landed in context/ versus what only ever got said in
chat. Five gaps and one stale claim repeated in four files.

New env gates were the biggest hole -- BT_TORSO_LOG, BT_MYOMERS_LOG,
BT_MYOMERS_REPAIR_TEST, BT_SELF_DAMAGE and BT_POWER_DETACH_TEST were all in the
code and none of them in decomp-reference §6, which is supposed to be the hub.
Added with the reasoning that makes them usable: why the myomers probe samples
every frame while unpowered (the NoVoltage window is about a second and a 1 Hz
probe steps straight over it), why the repair test also forces Manual (or
AutoConnect restores power a frame later), why SELF_DAMAGE latches off at the
first death, and why DETACH_TEST taking a NAME is what proves failover rather
than a same-generator re-attach.

The 6am log day was in the code and the player bats but not the KB. Now in
build-and-run with the stem table, the unconditional append, the 8 MB part
roll-over and the BT_LOG-truncates trap, plus the operator-facing note in
operator-console and OPERATOR_GUIDE that you ask for the NEWEST log, never
"today's".

Recorded the crash-symbolization gap, which is the one with teeth. BTCrashFilter
writes a stack into the day log and its own comment claims "we hold the PDB". We
do not: no Release PDB is produced at all, and /O2 implies /Oy so the EBP walk is
unreliable anyway. When the Owens crash finally lands we get an address we cannot
resolve. Written down with the fix (/Oy-, /Zi + /DEBUG, archive the PDB per
build) rather than left as something I mentioned once.

New gotcha 22: HeatModelOff() reads simulationState == 1, i.e. "am I destroyed",
and has nothing to do with the heat model. Behaviour at the call sites is right,
the name is not, and while chasing #70 it reads as "novice pilots cannot twist"
and sends you hunting an experience-level bug that does not exist. Same misnomer
in torso/gyro/sensor headers.

Also documented the dist flavor trap, having nearly shipped it myself: mkdist
reads build/CMakeCache.txt, so a tree configured BT_STEAM=OFF silently produces
a -nosteam zip with no play_steam.bat and no steam_api.dll. OFF is the CMake
default; ON is the documented dev state.

Swept the stale `btl4.log` filename out of reconstruction-gotchas,
reconstruction-method, build-and-run and CLAUDE.md itself -- the log has been
<stem>_YYYYMMDD.log since 1777d5a and every "read btl4.log" instruction was
pointing at a file that is no longer written.

checkctx CLEAN.

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

context/operator-console.md

@@ -381,7 +381,7 @@ operator control link over a private tunnel (mesh VPN).
 |---|---|
 | `content/operator_relay.log` | the relay's own stdout, teed by the GUI. **Truncated at each session start** — so a Start Session destroys the evidence of the wedge it is being used to clear. Copy it first when diagnosing. |
 | `matchlogs/<peer>_<name>` | per-pod match reports, auto-uploaded on route -9 at each clean round end (relay modes only; a mid-round crash loses it) |
-| `content/join_YYYYMMDD.log` | the pod's own log — ONE file per day, appended, every session headed by `===== BT411 SESSION … =====`; **never** uploaded, only on the player's machine. Rotation was removed 2026-07-28: two generations used to be deleted by the player's own relaunches, which is how the 2026-07-27 Owens crash stacks were lost. |
+| `content/join_YYYYMMDD.log` | the pod's own log — ONE file per day, appended, every session headed by `===== BT411 SESSION … =====`; **never** uploaded, only on the player's machine. Rotation was removed 2026-07-28: two generations used to be deleted by the player's own relaunches, which is how the 2026-07-27 Owens crash stacks were lost. ⚠ **The log day runs 06:00 → 06:00 local**, so a session played after midnight stays filed under the evening it started (one playtest night = one file). Ask for the NEWEST `<stem>_*.log`, not "today's date". Stems: `solo`/`steam`/`join`/`joyconfig`. |
 | `content/lastrun_<mode>.txt` (mode = solo/join/steam/joyconfig) | the launch record (exe's first-breath block + the bat's exit line). Its ABSENCE after a run means the exe never reached WinMain — loader failure or antivirus (Gitea #41). Replaced `launch_report.txt`. |
 
 Every relay log line is wall-clock stamped (`_StampedOut`) so post-mortems can measure delays.