Promote the FIFA17 SBC dispatch repair: armed by the build, not by env

Retail Gates A-G passed on the pinned CardsDLL build (4706a881), and the repair
has been live-proven repeatedly, so it is now a promoted feature. Arming it from
OPENFUT_SBC_DISPATCH meant any launch that did not export it (Steam, the launcher
Launch button, a bare umu-run) silently lost the SBC screen to the known
response-to-deserializer dispatch defect, leaving a harness script as the only
working entry point.

REPAIR_PROMOTED is now a build constant with a compile-time contract, and both
install sites derive from it: sbc_dispatch::install always arms, and
sbc_trace::install derives the parser/notifier/controller-registration traces from
it because those traces ARE the repair decision inputs, not optional diagnostics.

Promotion weakens no check. Safety stays in the runtime evidence gate rather than a
flag: the worker still validates the exact CardsDLL signatures before installing a
detour, and decide() still requires the transport sentinel status, the pinned
category-response vtable captured while the response object was provably live,
balanced parser counts on the one parser thread, this generation notifier having
entered AND returned, the captured controller/model identity, and one repair per
deserializer generation. An unrecognised build leaves native execution untouched.

Rollback is a file swap (restore the previous version.dll via the hook harness
backup), the documented client rollback path, deliberately not an env kill-switch.

fmt clean, strict clippy clean on default and fifa17 features, 22 tests pass,
release cross-build to x86_64-pc-windows-gnu produces artifact 3641d581.

openfut-hook/src/fifa17.rs

@@ -79,7 +79,9 @@ unsafe extern "system" fn worker(_: *mut core::ffi::c_void) -> u32 {
     ));
     dump_modules();
     write_log("fifa17: worker complete (injection healthy)\n");
-    // Every SBC detour is deferred and inert unless its exact environment gate is `1`.
+    // The promoted SBC dispatch repair (and the evidence traces it decides on) arms
+    // itself from the build; its safety is the runtime signature/evidence gate. The
+    // remaining legacy experiment modules stay inert unless their env gate is `1`.
     crate::sbc_hook::install();
     crate::sbc_trace::install();
     crate::sbc_dispatch::install();

openfut-hook/src/sbc_dispatch.rs

@@ -1,8 +1,8 @@
 //! Guarded FIFA 17 SBC completion dispatch and passive event tracing.
 //!
-//! `OPENFUT_SBC_DISPATCH=1` permits one narrowly-scoped repair per native
-//! deserializer generation. The default and `OPENFUT_SBC_DISPATCH_TRACE=1` paths
-//! are behavior-preserving.
+//! The repair is a PROMOTED feature: it is armed by the build itself, never by an
+//! environment variable (see [`REPAIR_PROMOTED`]). Safety lives in the runtime
+//! evidence gate, not in a flag.
 
 use core::ffi::c_void;
 use core::sync::atomic::{AtomicBool, AtomicU64, AtomicUsize, Ordering};
@@ -44,6 +44,30 @@ const EVENT_SIGNATURE: [u8; EVENT_COPY_LEN] = [
 type CompletionFn = unsafe extern "system" fn(*mut c_void, *mut c_void) -> usize;
 type EventDispatchFn = unsafe extern "system" fn(*mut c_void, u32, *mut c_void) -> usize;
 
+/// The guarded native dispatch repair is PROMOTED: armed by the build, never by an
+/// environment variable. Retail Gates A–G passed on the pinned CardsDLL build, so a
+/// deployed hook must repair the SBC completion on every launch path (Steam, the
+/// launcher, or a bare `umu-run`) with nothing to export.
+///
+/// Promotion does NOT weaken any check — every guard stays in the runtime evidence
+/// gate rather than in a flag. `worker` still validates the exact CardsDLL
+/// signatures before installing a detour, and [`decide`] still requires the
+/// transport sentinel status, the pinned category-response vtable captured while
+/// the response object was provably live, balanced parser counts on the one parser
+/// thread, this generation's notifier having entered AND returned, the captured
+/// controller/model identity, and one repair per deserializer generation. Anything
+/// unrecognised leaves native execution untouched.
+///
+/// Rollback is a file swap (restore the previous `version.dll`) — the documented
+/// client rollback path — deliberately not an env kill-switch.
+pub(crate) const REPAIR_PROMOTED: bool = true;
+
+/// Compile-time contract: the repair stays armed by the build. Flipping this back to
+/// an env gate would silently cost a normal launch (Steam or the launcher) its SBC
+/// screen, which is exactly the regression promotion removed — so it must be a
+/// deliberate, visible change here rather than a missing variable at runtime.
+const _: () = assert!(REPAIR_PROMOTED);
+
 static REPAIR_ENABLED: AtomicBool = AtomicBool::new(false);
 static COMPLETION_TRAMPOLINE: AtomicUsize = AtomicUsize::new(0);
 static EVENT_TRAMPOLINE: AtomicUsize = AtomicUsize::new(0);
@@ -691,22 +715,12 @@ unsafe fn worker() {
 }
 
 pub(crate) fn install() {
-    let repair =
-        crate::sbc_trace::env_enabled(std::env::var("OPENFUT_SBC_DISPATCH").ok().as_deref());
-    let trace = repair
-        || crate::sbc_trace::env_enabled(
-            std::env::var("OPENFUT_SBC_DISPATCH_TRACE").ok().as_deref(),
-        );
-    REPAIR_ENABLED.store(repair, Ordering::Release);
-    if !trace {
-        crate::write_log("SBC_DISPATCH: disabled\n");
-        return;
-    }
-    crate::write_log(if repair {
-        "SBC_DISPATCH: repair ARMED; strict native evidence gate enabled\n"
-    } else {
-        "SBC_DISPATCH: passive trace requested; repair disabled\n"
-    });
+    // Promoted: armed by the build. No environment variable participates in the
+    // decision, so every launch path behaves identically.
+    REPAIR_ENABLED.store(REPAIR_PROMOTED, Ordering::Release);
+    crate::write_log(
+        "SBC_DISPATCH: repair ARMED (promoted); strict native evidence gate enabled\n",
+    );
     std::thread::spawn(|| unsafe { worker() });
 }
 

openfut-hook/src/sbc_trace.rs

@@ -1148,7 +1148,9 @@ fn install_notifier(enabled: bool) {
 }
 
 pub(crate) fn install() {
-    let dispatch_repair = env_enabled(std::env::var("OPENFUT_SBC_DISPATCH").ok().as_deref());
+    // The repair's evidence traces (parser, notifier, controller registration) are
+    // its decision inputs, so they follow the promoted repair, not an env var.
+    let dispatch_repair = crate::sbc_dispatch::REPAIR_PROMOTED;
     let dispatch_trace =
         dispatch_repair || env_enabled(std::env::var("OPENFUT_SBC_DISPATCH_TRACE").ok().as_deref());
     let enabled =