diff --git a/ModularBot_garage/src/ModularBot.nim b/ModularBot_garage/src/ModularBot.nim
index 1e1fc0a..e55f8a2 100644
--- a/ModularBot_garage/src/ModularBot.nim
+++ b/ModularBot_garage/src/ModularBot.nim
@@ -36,6 +36,7 @@ import movement_harness/virtual_bodies as mvb
 import movement_harness/bullet_shadows
 import targeting/enemy_tracker
 import targeting/target_selector
+import env_report
 
 const botJsonPath = currentSourcePath().parentDir / "ModularBot.json"
 const DebugVBullets = false
@@ -1261,4 +1262,23 @@ when isMainModule:
   # Must run AFTER the gun constructors (Tsetlin/TMSelector call randomize()
   # unconditionally) so the explicit seed override is the value that survives.
   seedSelectorRng()
+  # Boot-time environment report (once per process, stdout). Prints what env
+  # this process actually inherited, the resolved effective value of every
+  # documented knob, and the build identity behind `grep '^\[env\]'`.
+  printEnvReport(EnvReportContext(
+    movementName:     MovementName,
+    vBulletAdmitOnly: VBulletAdmitOnly,
+    recordWorldState: RecordWorldState,
+    radarForceSpin:   RadarForceSpin,
+    radarScanLog:     RadarScanLog,
+    radarScanLogPath: RadarScanLogPath,
+    trackerProbe:     TrackerProbe,
+    trackerProbePath: TrackerProbePath,
+    powerLog:         PowerLog,
+    gunStatsPath:     GunStatsPath,
+    shotLogPath:      ShotLogPath,
+    disabledGuns:     DisabledGuns,
+    tmHorizon:        bot.tmHorizon,
+    patternMatcher:   bot.patternMatcher,
+  ))
   start(bot, botJsonPath)
diff --git a/ModularBot_garage/src/env_report.nim b/ModularBot_garage/src/env_report.nim
new file mode 100644
index 0000000..8739332
--- /dev/null
+++ b/ModularBot_garage/src/env_report.nim
@@ -0,0 +1,334 @@
+## Boot-time environment report for ModularBot.
+##
+## The user runs the bot behind the SERVER/GUI, so the bot inherits the
+## SERVER's environment — not the environment of whatever terminal they
+## exported a variable in. This report answers, once per process at boot and
+## in stdout, two questions:
+##
+##   A. What TR_*/GUN_* variables did THIS process actually receive? (plus the
+##      process identity — pid, parent pid, parent command line — so "I exported
+##      it in the wrong terminal" is obvious at a glance).
+##   B. For every documented knob, what value will the bot actually use and did
+##      it come from the env or from the shipped default?
+##
+## Every line starts with `[env]` so the whole interface is:
+##
+##     grep '^\[env\]' /tmp/modularbot_stdout.log
+##
+## It runs once (idempotent guard) and can be suppressed with TR_ENV_REPORT=0.
+## It deliberately does NOT dump the whole environment: only TR_*/GUN_* are
+## printed, because unrelated variables may hold secrets or machine paths.
+
+import std/[os, strutils, algorithm, times, sets]
+import gun_harness/virtual_bullets
+import gun_harness/selector
+import movements/ram_decision
+import movements/the_floor_is_lava_ring
+import guns/tm_horizon
+import guns/pattern_matcher
+
+const EnvReportEnableEnvVar* = "TR_ENV_REPORT"
+
+# ── resolved values that live in ModularBot.nim (not importable here) ─────────
+
+type
+  EnvReportContext* = object
+    ## Everything the report needs that ModularBot owns. Values are the
+    ## RESOLVED process-start values, not re-reads, so the report cannot
+    ## diverge from what the bot will actually use.
+    movementName*:     string
+    vBulletAdmitOnly*: bool
+    recordWorldState*: bool
+    radarForceSpin*:   bool
+    radarScanLog*:     bool
+    radarScanLogPath*: string
+    trackerProbe*:     bool
+    trackerProbePath*: string
+    powerLog*:         bool
+    gunStatsPath*:     string
+    shotLogPath*:      string
+    disabledGuns*:     HashSet[int]
+    tmHorizon*:        TmHorizonGun
+    patternMatcher*:   PatternMatcherGun
+
+# ── helpers ──────────────────────────────────────────────────────────────────
+
+proc onOff(b: bool): string {.inline.} = (if b: "on" else: "off")
+
+proc metricName(m: BulletMetric): string =
+  case m
+  of bmPoint: "point"
+  of bmPath:  "path"
+
+proc selectorModeName(m: SelectorMode): string =
+  case m
+  of smAbsolute: "absolute"
+  of smRelative: "relative"
+
+proc rankName(r: RankStat): string =
+  ## The word `GUN_SELECTOR_RANK` accepts on the command line, not the enum.
+  case r
+  of rsMean:     "mean"
+  of rsWilson:   "wilson"
+  of rsUCB:      "ucb"
+  of rsThompson: "thompson"
+  of rsShrunk:   "shrunk"
+
+proc tieBreakName(t: TieBreakMode): string =
+  case t
+  of tbOff:         "off"
+  of tbPoint:       "point"
+  of tbPointCommit: "pointCommit"
+
+proc sourceOf(name: string): string =
+  ## Parsed-value knobs go through `getEnv(name, "")`; an empty value means the
+  ## shipped default, so a non-empty value is the only thing that counts as
+  ## "from the env".
+  if getEnv(name, "").len > 0: "env" else: "default"
+
+proc sourceOfPresence(name: string): string =
+  ## Flags read with `existsEnv` are "from the env" whenever they are present,
+  ## even if their value is "0" (presence is what the code tests).
+  if existsEnv(name): "env" else: "default"
+
+proc disabledGunsString(guns: HashSet[int]): string =
+  if guns.len == 0: return "none"
+  var ids: seq[int]
+  for id in guns: ids.add id
+  ids.sort()
+  for i, id in ids:
+    if i > 0: result.add ","
+    result.add $id
+
+proc emit(name, value, source: string) =
+  echo "[env] ", name, " = ", value, "  (source: ", source, ")"
+
+proc readProcFile(path: string): string =
+  ## Best-effort /proc read; never raises, returns "" when unavailable.
+  try: readFile(path)
+  except CatchableError: ""
+
+proc ppidFromStatus(): int =
+  for line in readProcFile("/proc/self/status").splitLines():
+    if line.startsWith("PPid:"):
+      let parts = line.splitWhitespace()
+      if parts.len >= 2:
+        try: return parseInt(parts[1])
+        except ValueError: return -1
+  -1
+
+proc cmdlineOf(pid: int): string =
+  ## NUL-separated argv from /proc/<pid>/cmdline, flattened for display.
+  if pid < 0: return "(unavailable)"
+  let raw = readProcFile("/proc/" & $pid & "/cmdline")
+  if raw.len == 0: return "(unavailable)"
+  result = raw.replace('\0', ' ').strip()
+  if result.len == 0: result = "(available but empty)"
+
+proc selfCmdline(): string =
+  let raw = readProcFile("/proc/self/cmdline")
+  if raw.len == 0:
+    return getAppFilename()
+  result = raw.replace('\0', ' ').strip()
+  if result.len == 0: result = getAppFilename()
+
+# ── section A: the raw process environment + process identity ────────────────
+
+proc printRawEnvironment() =
+  echo "[env] --- A. raw process environment (what THIS process really has) ---"
+
+  var rawVars: seq[(string, string)]
+  var total = 0
+  for key, val in envPairs():
+    inc total
+    if key.startsWith("TR_") or key.startsWith("GUN_"):
+      rawVars.add (key, val)
+  rawVars.sort(proc(a, b: (string, string)): int = cmp(a[0], b[0]))
+
+  for (key, val) in rawVars:
+    echo "[env] ", key, "=", val
+
+  echo "[env] raw: ", rawVars.len, " TR_*/GUN_* of ", total,
+       " total environment variables"
+
+  if rawVars.len == 0:
+    echo "[env] WARNING: this process has NO TR_*/GUN_* variables - the env you " &
+         "exported did NOT reach the bot. See docs/env_reference.md."
+
+  # Process identity. The parent is the process that SPAWNED the bot: while
+  # running under the GUI it is the SERVER/GUI, never the user's interactive
+  # shell — which is exactly why exporting in an unrelated terminal does nothing.
+  let pid = getCurrentProcessId()
+  let ppid = ppidFromStatus()
+  echo "[env] pid=", pid, " ppid=", ppid
+  echo "[env] cwd=", getCurrentDir()
+  echo "[env] self_cmd=", selfCmdline()
+  echo "[env] parent_cmd=", cmdlineOf(ppid)
+
+# ── section B: effective values ──────────────────────────────────────────────
+
+proc printEffectiveValues(ctx: EnvReportContext) =
+  echo "[env] --- B. effective values (resolved at boot) ---"
+
+  # ── movement / process-level ModularBot knobs ─────────────────────────────
+  # Only `tfil_ring` selects the ring engine; every other value runs `tfil`, so
+  # report the RESOLVED engine rather than the raw string.
+  let effectiveMovement = if ctx.movementName == "tfil_ring": "tfil_ring" else: "tfil"
+  emit("TR_MOVEMENT", effectiveMovement, sourceOf("TR_MOVEMENT"))
+  emit("TR_MOVEMENT_LOG", onOff(MovementLog), sourceOfPresence("TR_MOVEMENT_LOG"))
+  emit("TR_VBULLET_ADMIT_ONLY", onOff(ctx.vBulletAdmitOnly),
+       sourceOf("TR_VBULLET_ADMIT_ONLY"))
+  emit("TR_POWER_LOG", onOff(ctx.powerLog), sourceOfPresence("TR_POWER_LOG"))
+  emit("TR_RECORD_WORLDSTATE", onOff(ctx.recordWorldState),
+       sourceOfPresence("TR_RECORD_WORLDSTATE"))
+  emit("TR_RADAR_FORCE_SPIN", onOff(ctx.radarForceSpin),
+       sourceOfPresence("TR_RADAR_FORCE_SPIN"))
+  emit("TR_RADAR_SCANLOG", onOff(ctx.radarScanLog),
+       sourceOfPresence("TR_RADAR_SCANLOG"))
+  emit("TR_RADAR_SCAN_LOG_PATH", ctx.radarScanLogPath,
+       sourceOf("TR_RADAR_SCAN_LOG_PATH"))
+  emit("TR_TRACKER_PROBE", onOff(ctx.trackerProbe),
+       sourceOfPresence("TR_TRACKER_PROBE"))
+  emit("TR_TRACKER_PROBE_PATH", ctx.trackerProbePath,
+       sourceOf("TR_TRACKER_PROBE_PATH"))
+  emit("GUN_STATS_PATH", ctx.gunStatsPath, sourceOf("GUN_STATS_PATH"))
+  emit("GUN_SHOTLOG_PATH", ctx.shotLogPath, sourceOf("GUN_SHOTLOG_PATH"))
+  let seed = getEnv("GUN_SELECTOR_SEED", "")
+  if seed.len > 0:
+    emit("GUN_SELECTOR_SEED", seed, "env")
+  else:
+    emit("GUN_SELECTOR_SEED", "(unset -> time+pid)", "default")
+
+  # ── rack ──────────────────────────────────────────────────────────────────
+  emit("GUN_RACK_DISABLE", disabledGunsString(ctx.disabledGuns),
+       sourceOf("GUN_RACK_DISABLE"))
+  for i in 0..<len(RackGunNames):
+    let name = "TR_RACK_" & RackGunNames[i]
+    emit(name, rackMembershipName(ActiveRackMembership[i]), sourceOf(name))
+  echo "[env] rack active 1v1 = ", rackActive(ActiveRackMembership, rm1v1)
+  echo "[env] rack active melee = ", rackActive(ActiveRackMembership, rmMelee)
+
+  # ── the selector (virtual-bullet fitness) ─────────────────────────────────
+  emit("GUN_VBULLET_METRIC", metricName(ActiveMetric), sourceOf("GUN_VBULLET_METRIC"))
+  emit("GUN_SELECTOR_MODE", selectorModeName(ActiveSelectorMode), sourceOf("GUN_SELECTOR_MODE"))
+  emit("GUN_SELECTOR_WINDOW", $ActiveWindow, sourceOf("GUN_SELECTOR_WINDOW"))
+  emit("GUN_SELECTOR_MINOBS", $ActiveMinObs, sourceOf("GUN_SELECTOR_MINOBS"))
+  emit("GUN_SELECTOR_TIE", $ActiveRelTie, sourceOf("GUN_SELECTOR_TIE"))
+  emit("GUN_SELECTOR_FLOOR", $ActiveFloorFrac, sourceOf("GUN_SELECTOR_FLOOR"))
+  emit("GUN_SELECTOR_POOL", onOff(ActivePooled), sourceOf("GUN_SELECTOR_POOL"))
+  emit("GUN_SELECTOR_RANK", rankName(ActiveRank), sourceOf("GUN_SELECTOR_RANK"))
+  emit("GUN_SELECTOR_SHRINK", $ActiveShrink, sourceOf("GUN_SELECTOR_SHRINK"))
+  emit("GUN_SELECTOR_DWELL", $ActiveDwellTicks, sourceOf("GUN_SELECTOR_DWELL"))
+  emit("GUN_SELECTOR_MARGIN", $ActiveSwitchMargin, sourceOf("GUN_SELECTOR_MARGIN"))
+  emit("GUN_SELECTOR_TIEBREAK", tieBreakName(ActiveTieBreak), sourceOf("GUN_SELECTOR_TIEBREAK"))
+  emit("GUN_SELECTOR_POINT_TIE", $ActivePointTie, sourceOf("GUN_SELECTOR_POINT_TIE"))
+
+  # ── the power policy ──────────────────────────────────────────────────────
+  emit("TR_POWER_POLICY", onOff(PowerPolicyEnabled), sourceOf("TR_POWER_POLICY"))
+  emit("TR_POWER_FAR_DIST", $PowerFarDist, sourceOf("TR_POWER_FAR_DIST"))
+  emit("TR_POWER_FAR_CAP", $PowerFarCap, sourceOf("TR_POWER_FAR_CAP"))
+  emit("TR_POWER_MID_CAP", $PowerMidCap, sourceOf("TR_POWER_MID_CAP"))
+  emit("TR_POWER_REF", $PowerRefFixed, sourceOf("TR_POWER_REF"))
+  emit("TR_POWER_ENERGY_HI", $PowerEnergyHi, sourceOf("TR_POWER_ENERGY_HI"))
+  emit("TR_POWER_ENERGY_LO", $PowerEnergyLo, sourceOf("TR_POWER_ENERGY_LO"))
+  emit("TR_POWER_ENERGY_MIN", $PowerEnergyMin, sourceOf("TR_POWER_ENERGY_MIN"))
+  emit("TR_POWER_ENERGY_MAX", $PowerEnergyMax, sourceOf("TR_POWER_ENERGY_MAX"))
+  emit("TR_POWER_FINISH_KILL", onOff(PowerFinishKill),
+       sourceOf("TR_POWER_FINISH_KILL"))
+
+  # ── movement (TFIL ring) ──────────────────────────────────────────────────
+  emit("TR_TFIL_RANGE_LO", $RangeLo, sourceOf("TR_TFIL_RANGE_LO"))
+  emit("TR_TFIL_RANGE_HI", $RangeHi, sourceOf("TR_TFIL_RANGE_HI"))
+  emit("TR_TFIL_RANGE_TEMP", $RangeTemp, sourceOf("TR_TFIL_RANGE_TEMP"))
+  emit("TR_TFIL_RANGE_K", $RangeK, sourceOf("TR_TFIL_RANGE_K"))
+  emit("TR_TFIL_CORRIDOR_HEAT", $CorridorHeat, sourceOf("TR_TFIL_CORRIDOR_HEAT"))
+  emit("TR_TFIL_WALL_HOTNESS", $WallHotness, sourceOf("TR_TFIL_WALL_HOTNESS"))
+
+  # ── ramming ───────────────────────────────────────────────────────────────
+  emit("TR_RAM_OPPORTUNITY", onOff(RamOppEnabled), sourceOf("TR_RAM_OPPORTUNITY"))
+  emit("TR_RAM_OPP_DIST", $RamOppDist, sourceOf("TR_RAM_OPP_DIST"))
+  emit("TR_RAM_OPP_MARGIN", $RamOppMargin, sourceOf("TR_RAM_OPP_MARGIN"))
+  emit("TR_RAM_ABORT_DMG", $RamAbortDmg, sourceOf("TR_RAM_ABORT_DMG"))
+  emit("TR_RAM_PLAN", onOff(RamPlanEnabled), sourceOf("TR_RAM_PLAN"))
+  emit("TR_RAM_PLAN_DIST", $RamPlanDist, sourceOf("TR_RAM_PLAN_DIST"))
+  emit("TR_RAM_PLAN_MARGIN", $RamPlanMargin, sourceOf("TR_RAM_PLAN_MARGIN"))
+  emit("TR_RAM_PLAN_HITRATE", $RamPlanHitRate, sourceOf("TR_RAM_PLAN_HITRATE"))
+  emit("TR_RAM_LOG", onOff(RamLog), sourceOfPresence("TR_RAM_LOG"))
+
+  # ── the horizon TM gun ────────────────────────────────────────────────────
+  # `resetLearning`/`targetChanged` resolve the lazily-read fields at round
+  # start; force them here on a COPY so the report reads real resolved values
+  # without touching the live gun's state.
+  var tmh = ctx.tmHorizon
+  discard tmh.targetChanged(-1)
+  emit("TR_TMHORIZON_SHIFT", $tmh.shiftDeg, sourceOf("TR_TMHORIZON_SHIFT"))
+  emit("TR_TMHORIZON_BIG_MULT", $tmh.bigMult, sourceOf("TR_TMHORIZON_BIG_MULT"))
+  emit("TR_TMHORIZON_LOG", onOff(tmh.logEnabled), sourceOfPresence("TR_TMHORIZON_LOG"))
+  emit("TR_TMHORIZON_RESET_ON_TARGET", onOff(tmh.resetOnTarget),
+       sourceOf("TR_TMHORIZON_RESET_ON_TARGET"))
+  emit("TR_TMHORIZON_NSTATES", $tmh.nStates, sourceOf("TR_TMHORIZON_NSTATES"))
+  emit("TR_TMHORIZON_WINDOW", $tmh.windowN, sourceOf("TR_TMHORIZON_WINDOW"))
+  emit("TR_TMHORIZON_RESET_DROP", $tmh.resetDrop, sourceOf("TR_TMHORIZON_RESET_DROP"))
+  emit("TR_TMHORIZON_ACCURVE", onOff(tmh.accurveEnabled),
+       sourceOfPresence("TR_TMHORIZON_ACCURVE"))
+  emit("TR_TMHORIZON_RETRAIN_EVERY", $tmh.retrainEvery,
+       sourceOf("TR_TMHORIZON_RETRAIN_EVERY"))
+  emit("TR_TMHORIZON_EPOCHS", $tmh.retrainEpochs, sourceOf("TR_TMHORIZON_EPOCHS"))
+
+  # ── Pattern radial knobs ──────────────────────────────────────────────────
+  # These are resolved lazily inside `predict` (which has not run at boot), so
+  # unless something already forced them we report the raw env value and say so.
+  if ctx.patternMatcher.radConfigured:
+    emit("TR_PATTERN_RAD_OFFSET", $ctx.patternMatcher.radOffset, sourceOf("TR_PATTERN_RAD_OFFSET"))
+    emit("TR_PATTERN_RAD_SCALE", $ctx.patternMatcher.radScale, sourceOf("TR_PATTERN_RAD_SCALE"))
+  else:
+    echo "[env] TR_PATTERN_RAD_OFFSET = ",
+         getEnv("TR_PATTERN_RAD_OFFSET", "0.0"), "  (raw - not resolved here)"
+    echo "[env] TR_PATTERN_RAD_SCALE = ",
+         getEnv("TR_PATTERN_RAD_SCALE", "1.0"), "  (raw - not resolved here)"
+
+  # ── the report's own switch ───────────────────────────────────────────────
+  emit(EnvReportEnableEnvVar, getEnv(EnvReportEnableEnvVar, "1"),
+       sourceOf(EnvReportEnableEnvVar))
+
+# ── build identity (which binary is the GUI actually running?) ───────────────
+
+proc printBuildIdentity() =
+  ## The user has been bitten by a stale binary. CompileDate/CompileTime are
+  ## available at runtime (even if a reproducible-build toolchain pins them),
+  ## and the binary path + mtime + size pin down the exact artifact.
+  echo "[env] --- build identity ---"
+  echo "[env] build nim=", NimVersion,
+       " compileDate=", CompileDate, " compileTime=", CompileTime
+  let bin = getAppFilename()
+  var size = -1
+  var mtime = "unknown"
+  if fileExists(bin):
+    try:
+      size = getFileSize(bin)
+      mtime = $getLastModificationTime(bin)
+    except CatchableError:
+      discard
+  echo "[env] build binary=", bin, " size=", size, " mtime=", mtime
+
+# ── the entry point ──────────────────────────────────────────────────────────
+
+var envReportDone = false
+
+proc printEnvReport*(ctx: EnvReportContext) =
+  ## Print the whole report exactly once per process, to stdout. Suppressed
+  ## (with one visible note) by TR_ENV_REPORT=0/false/no/off.
+  if envReportDone: return
+  envReportDone = true
+
+  let raw = getEnv(EnvReportEnableEnvVar, "").strip().toLowerAscii()
+  if raw in ["0", "false", "no", "off"]:
+    echo "[env] report suppressed by ", EnvReportEnableEnvVar, "=", raw,
+         " (unset or 1 to enable)"
+    return
+
+  echo "[env] === ENVIRONMENT (boot report) ==="
+  printRawEnvironment()
+  printEffectiveValues(ctx)
+  printBuildIdentity()
+  echo "[env] === END ENVIRONMENT ==="
diff --git a/docs/env_reference.md b/docs/env_reference.md
index bb883af..8c20328 100644
--- a/docs/env_reference.md
+++ b/docs/env_reference.md
@@ -9,6 +9,94 @@ Every knob the bot reads. **All are read ONCE at process start.**
 An unset (or empty, or unparseable) value means **the shipped default** — a typo
 can never silently change behaviour, it warns on stderr and falls back.
 
+Every process prints a one-shot, greppable boot report to stdout; see
+[Did my env vars actually reach the bot?](#did-my-env-vars-actually-reach-the-bot)
+below. `TR_ENV_REPORT=0` suppresses it.
+
+---
+
+## Did my env vars actually reach the bot?
+
+**The spawn trap:** the bot is spawned by the **server/GUI**, so it inherits the
+**server's** environment — exporting a variable in an unrelated terminal does
+nothing, because that terminal is not the bot's parent.
+
+### 1. Ask the bot itself (boot-time report)
+
+Every process prints a one-shot, greppable report to **stdout**
+(`/tmp/modularbot_stdout.log` when launched by the GUI, or the GUI/server
+console). Recover just the report with:
+
+```sh
+grep '^\[env\]' /tmp/modularbot_stdout.log
+```
+
+It has three parts, all behind `[env] === ENVIRONMENT ... ===`:
+
+- **A. raw process environment** — every `TR_*`/`GUN_*` this process *actually*
+  received, sorted, followed by
+  `raw: N TR_*/GUN_* of M total environment variables`. It then prints the
+  process identity: `pid`/`ppid`, the cwd, the bot's own command line, and the
+  **parent's command line**. The parent command line is the conclusive proof of
+  which process spawned the bot (the server/GUI — not your shell). If nothing
+  matched it prints a loud
+  `[env] WARNING: this process has NO TR_*/GUN_* variables - the env you exported did NOT reach the bot.`
+- **B. effective values** — for every knob, the value the bot will *actually*
+  use and whether it came from `env` or the shipped `default`, including the
+  effects of parsing, clamping and fallback (e.g. `TR_TMHORIZON_NSTATES` is
+  clamped to `2..4096`; `TR_RACK_*` shows the empty-set fallback). Where a value
+  is only resolvable later, it is labelled `(raw - not resolved here)` rather
+  than guessed.
+- **build identity** — `NimVersion`, compile date/time, and the binary path +
+  size + mtime, so a stale binary is obvious.
+
+Suppress the report with `TR_ENV_REPORT=0`.
+
+### 2. The no-code check (authoritative)
+
+`/proc/PID/environ` is the environment **at exec time** — exactly what the bot
+started with, before it read anything:
+
+```sh
+for p in $(pgrep -f ModularBot); do
+  echo "== $p"
+  tr '\0' '\n' < /proc/$p/environ | grep -E '^(TR_|GUN_)'
+done
+```
+
+### 3. Launching the GUI with knobs
+
+Export in the **same shell** that launches the GUI/server, then start it from
+that shell. Because the launcher **appends** to the log, clear it first so you
+read only the new run:
+
+```sh
+rm -f /tmp/modularbot_stdout.log
+export TR_POWER_ENERGY_MIN=1.0 TR_RACK_PATTERN=off
+./start-gui.sh                 # whatever launches the server/GUI
+grep '^\[env\]' /tmp/modularbot_stdout.log
+```
+
+### 4. Prove the trap deliberately
+
+Terminal A — where you *exported*, but never launched anything:
+
+```sh
+export TR_POWER_ENERGY_MIN=1.0
+```
+
+Terminal B — where you launch the GUI:
+
+```sh
+./start-gui.sh
+grep '^\[env\]' /tmp/modularbot_stdout.log | grep WARNING
+# [env] raw: 0 TR_*/GUN_* of ... total environment variables
+# [env] WARNING: this process has NO TR_*/GUN_* variables - the env you exported did NOT reach the bot.
+```
+
+Terminal A's variable never reached the bot because the bot's parent is the
+server, not terminal A. Fix it by exporting in terminal B before launching.
+
 ---
 
 ## The ones you'll actually use live
@@ -22,6 +110,7 @@ can never silently change behaviour, it warns on stderr and falls back.
 | `TR_RAM_LOG` | off | `1` = log ram on/off with the reason |
 | `TR_MOVEMENT_LOG` | off | `1` = log movement band/class changes |
 | `TR_TMHORIZON_LOG` | off | `1` = let the horizon TM gun log its thinking per shot |
+| `TR_ENV_REPORT` | `1` | print the boot-time `[env]` process-environment report to stdout; `0` suppresses it |
 
 ---
 
@@ -32,6 +121,7 @@ can never silently change behaviour, it warns on stderr and falls back.
 | `TR_RACK_<GUN>` | `PATTERN=both`, all others `off` | membership: `both` \| `1v1` \| `melee` \| `off` |
 | `GUN_RACK_DISABLE` | empty | comma-separated gun **ids** to remove entirely (older mechanism; the gun never even spawns virtual bullets) |
 | `GUN_STATS_PATH` | `/tmp/gun_stats.jsonl` | where the per-round per-gun stats are written |
+| `GUN_SHOTLOG_PATH` | `/tmp/shot_log.jsonl` | where the per-shot JSONL (Task A) is written |
 
 `<GUN>` names: `HEADON LINEAR TSETLIN CIRCULAR GUESSFACTOR PATTERN WALLBOUNCE ACCEL
 STOPSHOT DISPLACE AVGLEAD DECAYGF KNN TMSELECT TMPATTERN TMHORIZON`.
@@ -56,8 +146,14 @@ If **every** gun is `off`, the rack falls back to admitting all of them.
 | `GUN_SELECTOR_MODE` | `relative` | tie-band model: `relative` (scale-aware) or `absolute` (legacy fixed bars) |
 | `GUN_SELECTOR_WINDOW` | `100` | rolling window (ticks) for the fitness rates |
 | `GUN_SELECTOR_TIE` | `0.20` | tie band width: tied if `rate >= bestRate*(1-this)` |
+| `GUN_SELECTOR_FLOOR` | `0.25` | relative floor: fire HeadOn only if best rate < this × its peak |
+| `GUN_SELECTOR_MINOBS` | `50` | min observations before a gun×bin may compete (clamped to ≥1) |
+| `GUN_SELECTOR_POOL` | `on` | pool the gun's power bins when computing its rate |
+| `GUN_SELECTOR_RANK` | `mean` | window statistic: `mean` \| `wilson` \| `ucb` \| `thompson` \| `shrunk` |
+| `GUN_SELECTOR_SHRINK` | `20.0` | empirical-Bayes shrink strength (`shrunk` rank only) |
 | `GUN_SELECTOR_DWELL` | `10` | ticks the incumbent gun is held before it may be displaced |
 | `GUN_SELECTOR_MARGIN` | `0.05` | a challenger must beat the incumbent by this fraction to displace it |
+| `GUN_SELECTOR_SEED` | unset | integer seed for the tie-break RNG; unset = time+pid per process |
 | `GUN_SELECTOR_TIEBREAK` | `off` | `off` (shipped) / `point` / `pointCommit`. Measured **negative** on real hit rate; opt-in only |
 | `GUN_SELECTOR_POINT_TIE` | `0.5` | margin used by the `point` tie-break |
 
@@ -130,7 +226,7 @@ only path that converts.
 | `TR_TMHORIZON_BIG_MULT` | `1.5` | multiplier when the predicted correction is BIG |
 | `TR_TMHORIZON_NSTATES` | `64` | **automata inertia** — the "mood". Lower = adapts faster, higher = more stubborn (2…4096) |
 | `TR_TMHORIZON_RESET_ON_TARGET` | on | wipe the model when the target changes (no-op in 1v1) |
-| `TR_TMHORIZON_WINDOW` | `0` | sliding window: retrain on only the most recent N samples. `0` = keep everything |
+| `TR_TMHORIZON_WINDOW` | `0` | sliding window: retrain on only the most recent N samples. `0` = keep everything. **ON is MEASURED HARMFUL live: 26.5% vs 49.0% round wins, p=0.036 — keep it at `0`.** |
 | `TR_TMHORIZON_RESET_DROP` | `0` | change detection: if rolling accuracy falls this many points below its own peak, treat it as "the enemy changed" and re-learn |
 | `TR_TMHORIZON_ACCURVE` | off | `1` = log the rolling accuracy periodically |
 | `TR_TMHORIZON_RETRAIN_EVERY` | `50` | samples between windowed retrains |
@@ -156,6 +252,7 @@ bearing-only, so a purely radial offset is invisible. Measured byte-identical on
 | variable | default | what it does |
 |---|---|---|
 | `TR_VBULLET_ADMIT_ONLY` | `1` | only admitted guns spawn virtual bullets. **Turning it on gave +68% tick rate** (87→146 ticks/s); `0` restores the old behaviour |
+| `TR_ENV_REPORT` | `1` | print the boot-time `[env]` report to stdout; `0` suppresses it |
 | `TR_RECORD_WORLDSTATE` | off | append every tick's WorldState to `/tmp/worldstate_record.jsonl` for offline replay |
 | `TR_RADAR_FORCE_SPIN` | off | force the old stateless full-spin melee radar (for A/B on one binary) |
 | `TR_RADAR_SCANLOG` | off | append per-round radar scan/coverage JSON |
@@ -181,6 +278,7 @@ bearing-only, so a purely radial offset is invisible. Measured byte-identical on
 | `-d:TMH_STALE_MAX=N` | 8 | a sample is dropped if the enemy was not seen this recently |
 | `-d:TM_S_DEF=x` | `"3.0"` | `guns/tm_pattern.nim` specificity (`s`). **Higher = LONGER clauses**, measured. `s=1.0` is degenerate |
 | `-d:TM_NSTATES=N` | 64 | `guns/tm_pattern.nim` |
+| `-d:TM_NCLAUSES=N` | 40 | `guns/tm_pattern.nim` — clauses per class |
 
 ## Adding / finding knobs