diff --git a/src/shim/shim.cfg.cbpin b/src/shim/shim.cfg.cbpin
index 042542a..b02ffb0 100644
--- a/src/shim/shim.cfg.cbpin
+++ b/src/shim/shim.cfg.cbpin
@@ -1,7 +1,17 @@
-# Lane CB -- the pinned creation-turn capture. `shim.cfg.cbcapture` with `aiseed=pin
-# The seeds run C3 (unpinned, same save, same guest, same build) observed for itself. Pinning
-# them reproduces a turn that actually happened rather than inventing one.
-aiseed.values=32=e70a4703,496=0c63ca36,512=372be4df`.
+# Lane CB -- the pinned creation-turn capture. `shim.cfg.cbcapture` with `aiseed=pin`.
+#
+# 2026-09-09: this header used to wrap onto a LIVE `aiseed.values=` line carrying a trailing
+# backtick, so the file both contradicted its own "filled in per run" note and shipped a stray
+# setting ahead of the real one at the bottom. Lane BP found it while copying the file, and its
+# own first draft reproduced the same wrap -- which is what a trap looks like. The seeds now
+# appear exactly once, at the end, next to `aiseed=pin`.
+#
+# exhaustive
+#
+# ^ that marker is checked by tools/check_shim_configs.py: this is a determinism probe,
+# so it must name EVERY registered hook, because under `hooks=trace` one it forgets is
+# a detour it did not ask for -- and on a determinism probe an extra detour is exactly
+# what rule 19 says can move the bytes. Six were missing until lane BP found them.
 #
 # WHY PINNING IS NOT CHEATING. Lane L1 showed every AI client's generator is seeded with a
 # fresh per-process word, so `turn1-state -> turn2` has an outcome set of size k > 1 and NO
@@ -33,6 +43,16 @@ hook.Game::StrategyServer::NodeLineDecay=off
 hook.Game::StrategyServer::ProcessNodeSpaceTravel=off
 hook.Game::EncounterDetect::AssignContacts=off
 hook.Game::EncounterDetect::ProcessTeamRecord=off
+# These six were absent, and under `hooks=trace` an unnamed hook defaults back ON -- so this
+# config was quietly running six more detours than it claimed. Lane BP, 2026-09-09. Name every
+# registered hook; a template that lists most of them is worse than one that lists none, because
+# it reads as exhaustive.
+hook.Game::StrategyServer::BeginProcessTurn=off
+hook.Game::SVSOSwarmQueen::OnTurnBegin=off
+hook.Game::SVSOSwarmQueen::RegisterHives=off
+hook.Game::SVSOSwarmQueen::TickHives=off
+hook.Game::SVSOSlaversRefuel::UpdateDifficultyTier=off
+hook.Mars::RNG::Seed=off
 trace.path=C:\SOTS\shim.trace.jsonl
 trace.flush=always
 probes=off
diff --git a/tools/check_shim_configs.py b/tools/check_shim_configs.py
new file mode 100644
index 0000000..fe5e470
--- /dev/null
+++ b/tools/check_shim_configs.py
@@ -0,0 +1,112 @@
+#!/usr/bin/env python3
+"""Structural checks on the shim.cfg.* templates.
+
+Lane BP found two defects in `shim.cfg.cbpin` while copying it for a determinism
+probe, and its own first draft reproduced one of them -- which is what a trap looks
+like.  Both are checked here:
+
+  * A **wrapped header comment landing on a live setting.**  `cbpin`'s first line ran
+    on past the comment and left `aiseed.values=...\\u0060.` as a real setting ahead of the
+    real one at the bottom, so the file contradicted its own "filled in per run" note.
+  * A **key set twice.**  The last one silently wins, which is exactly how a stale
+    value hides in a config nobody re-reads.
+
+There is deliberately **no global check that a template names every registered
+hook**.  `hooks=trace` means "trace everything except what is turned off", and most
+templates rely on that on purpose -- an exhaustiveness rule applied to all of them
+would be a rule about a style nobody agreed to.  It matters only where a lane wants
+a *minimal* hook set, and no file states that intent, so a template opts in by
+carrying a line reading exactly `# exhaustive` in its header.  For those, an unnamed
+hook is a detour the config did not ask for, and on a determinism probe an extra
+detour is precisely what rule 19 says can move the bytes.
+
+Exits non-zero with the offending file and what is wrong with it.
+"""
+import pathlib
+import re
+import sys
+
+ROOT = pathlib.Path(__file__).resolve().parent.parent
+SRC = ROOT / "src" / "shim"
+
+# A hook declares itself with `static constexpr const char* name = "...";`
+NAME_RE = re.compile(r'static\s+constexpr\s+const\s+char\*\s+name\s*=\s*"([^"]+)"')
+HOOK_RE = re.compile(r"^hook\.([^=]+)=")
+
+# Not real hooks: the doc-comment's example in trace/hook.h, and the self-test hooks,
+# which exist to make the harness fail on purpose and are never part of a measurement.
+EXEMPT = {"Game::Foo"}
+EXEMPT_PREFIXES = ("Shim::SelfTest::",)
+
+# Settings whose values legitimately end in a period or a path separator.
+PROSE_SAFE = ("path", "out", "dir", "file")
+
+
+def registered_hooks():
+    names = set()
+    for path in SRC.rglob("*"):
+        if path.suffix in (".h", ".cpp"):
+            for m in NAME_RE.finditer(path.read_text(encoding="utf-8", errors="replace")):
+                names.add(m.group(1))
+    return {n for n in names if n not in EXEMPT and not n.startswith(EXEMPT_PREFIXES)}
+
+
+def check(cfg, hooks):
+    problems = []
+    lines = cfg.read_text(encoding="utf-8", errors="replace").splitlines()
+    settings = [l for l in lines if l.strip() and not l.lstrip().startswith("#")]
+
+    for l in settings:
+        key = l.split("=", 1)[0].strip()
+        if "=" not in l:
+            problems.append(f"line is neither a comment nor a setting: {l!r}")
+        elif l.rstrip().endswith(("`", "`.")) or (
+            l.rstrip().endswith(".") and not any(p in key.lower() for p in PROSE_SAFE)
+        ):
+            problems.append(f"setting looks like a wrapped comment: {l!r}")
+
+    seen = {}
+    for l in settings:
+        key = l.split("=", 1)[0].strip()
+        if key in seen:
+            problems.append(f"{key!r} set twice ({seen[key]!r} then {l!r})")
+        seen[key] = l
+
+    if any(l.strip() == "# exhaustive" for l in lines):
+        if not any(l.strip() == "hooks=trace" for l in settings):
+            problems.append("declares `# exhaustive` but does not set `hooks=trace`, so it does nothing")
+        named = {m.group(1) for m in (HOOK_RE.match(l) for l in settings) if m}
+        missing = sorted(hooks - named)
+        if missing:
+            problems.append(
+                f"declares `# exhaustive` but does not name {len(missing)} registered hook(s), "
+                "which therefore default ON: " + ", ".join(missing)
+            )
+    return problems
+
+
+def main():
+    hooks = registered_hooks()
+    if not hooks:
+        print("check_shim_configs: found no registered hooks -- the parser is wrong, not the configs")
+        return 1
+
+    failures = []
+    exhaustive = 0
+    for cfg in sorted(SRC.glob("shim.cfg.*")):
+        if any(l.strip() == "# exhaustive" for l in cfg.read_text(errors="replace").splitlines()):
+            exhaustive += 1
+        for p in check(cfg, hooks):
+            failures.append(f"{cfg.name}: {p}")
+
+    if failures:
+        print("check_shim_configs: FAILED")
+        for f in failures:
+            print("  " + f)
+        return 1
+    print(f"check_shim_configs: OK ({len(hooks)} registered hooks, {exhaustive} template(s) declared exhaustive)")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())