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>

targets/esp32s3.json

@@ -7,6 +7,13 @@
 	"scheduler": "tasks",
 	"serial": "usb",
 	"linker": "ld.lld",
+	"ldflags": [
+		"--wrap=malloc",
+		"--wrap=calloc",
+		"--wrap=free",
+		"--wrap=realloc",
+		"--wrap=ppCheckTxConnTrafficIdle"
+	],
 	"default-stack-size": 8192,
 	"rtlib": "compiler-rt",
 	"libc": "picolibc",