esp32s3: improve exception handlers, add procPin/procUnpin, and linker wrap flags

Rewrite kernel and double exception handlers to save EXCCAUSE/EPC1 to
RTC STORE registers before triggering a software reset, replacing the
LED-blink diagnostic with post-mortem debug info that survives reset.

Add user exception dispatch in the level-1 handler with a weak
espradio_user_exception symbol so programs without espradio still link.

Implement procPin/procUnpin for Xtensa using RSIL/WSR PS to properly
disable interrupts during atomic operations. Fix abort() to use a
waiti loop instead of bare spin.

Add --wrap ldflags for malloc/calloc/free/realloc/ppCheckTxConnTrafficIdle
to support espradio WiFi blob integration.

Signed-off-by: deadprogram <ron@hybridgroup.com>

src/runtime/runtime_esp32s3.go

@@ -96,8 +96,11 @@ func init() {
 }
 
 func abort() {
-	// lock up forever
 	print("abort called\n")
+	// lock up forever
+	for {
+		device.Asm("waiti 0")
+	}
 }
 
 // interruptInit installs the Xtensa vector table by writing its address