shim: exhaustive configs must also turn off the FPU sampling detours

Lane CR named all 27 template hooks off, passed check_shim_configs.py, and the
shim installed six detours: the M0 asm stub and the FPU-force module's four
sampling detours, on by default under keys that do not start with hook. The
checker was exhaustive over the wrong list. It now requires fpu.sample_turn and
fpu.sample_ticks off in an exhaustive config and names the M0 stub in its OK
line. All five exhaustive configs amended; their past measurements stand because
each was proved byte-neutral against a control.

src/shim/shim.cfg.bupin

@@ -116,3 +116,9 @@ aiseed.values=32=156ebbbd,496=fe7b2826,512=0ed341d1,*=deadbeef
 # With `aiseed=pin` and no values the module logs "PIN MODE WITH NO PINS -- every seed passes
 # through unchanged, so this run is NOT pinned and must not be reported as one". Read that, and
 # the three `aiseed call=... pinned=1` lines, in shim.log before trusting any run.
+
+# The FPU-force module installs FOUR sampling detours by default, controlled by keys that
+# do not start with hook. -- lane CR found a config naming all 27 template hooks still
+# installed six detours. An exhaustive config turns these off explicitly.
+fpu.sample_turn=off
+fpu.sample_ticks=off

src/shim/shim.cfg.cbpin

@@ -73,3 +73,9 @@ 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
+
+# The FPU-force module installs FOUR sampling detours by default, controlled by keys that
+# do not start with hook. -- lane CR found a config naming all 27 template hooks still
+# installed six detours. An exhaustive config turns these off explicitly.
+fpu.sample_turn=off
+fpu.sample_ticks=off

src/shim/shim.cfg.crcompare

@@ -33,3 +33,9 @@ research.replace_cascade=off
 trace.path=C:\SOTS\shim.trace.jsonl
 trace.inline_max=256
 trace.flush=always
+
+# The FPU-force module installs FOUR sampling detours by default, controlled by keys that
+# do not start with hook. -- lane CR found a config naming all 27 template hooks still
+# installed six detours. An exhaustive config turns these off explicitly.
+fpu.sample_turn=off
+fpu.sample_ticks=off

src/shim/shim.cfg.crreplace0

@@ -33,3 +33,9 @@ research.replace_cascade=off
 trace.path=C:\SOTS\shim.trace.jsonl
 trace.inline_max=256
 trace.flush=always
+
+# The FPU-force module installs FOUR sampling detours by default, controlled by keys that
+# do not start with hook. -- lane CR found a config naming all 27 template hooks still
+# installed six detours. An exhaustive config turns these off explicitly.
+fpu.sample_turn=off
+fpu.sample_ticks=off

src/shim/shim.cfg.crreplace1

@@ -33,3 +33,9 @@ research.replace_cascade=on
 trace.path=C:\SOTS\shim.trace.jsonl
 trace.inline_max=256
 trace.flush=always
+
+# The FPU-force module installs FOUR sampling detours by default, controlled by keys that
+# do not start with hook. -- lane CR found a config naming all 27 template hooks still
+# installed six detours. An exhaustive config turns these off explicitly.
+fpu.sample_turn=off
+fpu.sample_ticks=off

tools/check_shim_configs.py

@@ -38,6 +38,12 @@ HOOK_RE = re.compile(r"^hook\.([^=]+)=")
 EXEMPT = {"Game::Foo"}
 EXEMPT_PREFIXES = ("Shim::SelfTest::",)
 
+# Detours that are installed by default and are NOT template hooks. The FPU-force module's
+# sampling keys accept exactly `on`/`off`. The M0 asm stub has no key at all and is always
+# installed when `hooks != off`; it is mentioned in the OK line so nobody reads "27" as "all".
+ALWAYS_ON_UNLESS_OFF = ("fpu.sample_turn", "fpu.sample_ticks")
+UNNAMEABLE_DETOURS = ("Mars::Application::Initialize (M0 asm stub, always on unless hooks=off)",)
+
 # Settings whose values legitimately end in a period or a path separator.
 PROSE_SAFE = ("path", "out", "dir", "file")
 
@@ -82,6 +88,19 @@ def check(cfg, hooks):
                 f"declares `# exhaustive` but does not name {len(missing)} registered hook(s), "
                 "which therefore default ON: " + ", ".join(missing)
             )
+        # Template hooks are not the only detours. Lane CR named all 27, passed this check,
+        # and the shim installed SIX: the M0 Application::Initialize asm stub (unconditional
+        # whenever hooks != off -- it cannot be named off, so it is reported, not required)
+        # and the FPU-force module's four sampling detours, which are ON BY DEFAULT and are
+        # controlled by keys that do not start with `hook.`. An exhaustive config must turn
+        # those off explicitly, or "exhaustive" is a claim about the wrong list.
+        kv = {l.split("=", 1)[0].strip(): l.split("=", 1)[1].strip() for l in settings if "=" in l}
+        for key in ALWAYS_ON_UNLESS_OFF:
+            if kv.get(key) != "off":
+                problems.append(
+                    f"declares `# exhaustive` but `{key}` is not `off` (it defaults ON and installs "
+                    "detours no `hook.` key names)"
+                )
     return problems
 
 
@@ -104,7 +123,8 @@ def main():
         for f in failures:
             print("  " + f)
         return 1
-    print(f"check_shim_configs: OK ({len(hooks)} registered hooks, {exhaustive} template(s) declared exhaustive)")
+    print(f"check_shim_configs: OK ({len(hooks)} template hooks + {len(ALWAYS_ON_UNLESS_OFF)} default-on "
+          f"FPU sampling keys + {len(UNNAMEABLE_DETOURS)} unnameable detour; {exhaustive} template(s) declared exhaustive)")
     return 0