apps/examples/watchdog: Introduce new watchdog example

apps/examples/watchdog/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see kconfig-language at https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt
+#
+
+config EXAMPLES_WATCHDOG
+	bool "\"Watchdog Timer\" example"
+	default n
+	depends on WATCHDOG
+	---help---
+		Enable the watchdog example command.
+		The example supports expire, keepalive, status, stop, pause, resume,
+		and pause_resume commands. expire optionally prints periodic
+		status, keepalive sends WDIOC_KEEPALIVE, and pause_resume runs
+		a parameterized pause/resume timing test.
+
+config USER_ENTRYPOINT
+	string
+	default "watchdog_main" if ENTRY_WATCHDOG

apps/examples/watchdog/Kconfig_ENTRY

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+config ENTRY_WATCHDOG
+	bool "\"Watchdog Timer\" example"
+	depends on EXAMPLES_WATCHDOG

apps/examples/watchdog/Make.defs

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+###########################################################################
+#
+# Copyright 2026 Samsung Electronics All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+# either express or implied. See the License for the specific
+# language governing permissions and limitations under the License.
+#
+###########################################################################
+############################################################################
+# apps/examples/watchdog/Make.defs
+############################################################################
+
+ifeq ($(CONFIG_EXAMPLES_WATCHDOG),y)
+CONFIGURED_APPS += examples/watchdog
+endif

apps/examples/watchdog/Makefile

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+###########################################################################
+#
+# Copyright 2026 Samsung Electronics All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+# either express or implied. See the License for the specific
+# language governing permissions and limitations under the License.
+#
+###########################################################################
+############################################################################
+# apps/examples/watchdog/Makefile
+############################################################################
+
+-include $(TOPDIR)/.config
+-include $(TOPDIR)/Make.defs
+include $(APPDIR)/Make.defs
+
+APPNAME = watchdog
+FUNCNAME = $(APPNAME)_main
+PRIORITY = SCHED_PRIORITY_DEFAULT
+STACKSIZE = 2048
+THREADEXEC = TASH_EXECMD_ASYNC
+
+ASRCS =
+CSRCS =
+MAINSRC = watchdog_main.c
+
+AOBJS = $(ASRCS:.S=$(OBJEXT))
+COBJS = $(CSRCS:.c=$(OBJEXT))
+MAINOBJ = $(MAINSRC:.c=$(OBJEXT))
+
+SRCS = $(ASRCS) $(CSRCS) $(MAINSRC)
+OBJS = $(AOBJS) $(COBJS)
+
+ifneq ($(CONFIG_BUILD_KERNEL),y)
+  OBJS += $(MAINOBJ)
+endif
+
+ifeq ($(CONFIG_WINDOWS_NATIVE),y)
+  BIN = $(APPDIR)\libapps$(LIBEXT)
+else
+ifeq ($(WINTOOL),y)
+  BIN = $(APPDIR)\\libapps$(LIBEXT)
+else
+  BIN = $(APPDIR)/libapps$(LIBEXT)
+endif
+endif
+
+ifeq ($(WINTOOL),y)
+  INSTALL_DIR = "${shell cygpath -w $(BIN_DIR)}"
+else
+  INSTALL_DIR = $(BIN_DIR)
+endif
+
+CONFIG_EXAMPLES_WATCHDOG_PROGNAME ?= $(APPNAME)$(EXEEXT)
+PROGNAME = $(CONFIG_EXAMPLES_WATCHDOG_PROGNAME)
+
+ROOTDEPPATH = --dep-path .
+
+VPATH =
+
+all: .built
+.PHONY: clean depend distclean
+
+$(AOBJS): %$(OBJEXT): %.S
+	$(call ASSEMBLE, $<, $@)
+
+$(COBJS) $(MAINOBJ): %$(OBJEXT): %.c
+	$(call COMPILE, $<, $@)
+
+.built: $(OBJS)
+	$(call ARCHIVE, $(BIN), $(OBJS))
+	@touch .built
+
+ifeq ($(CONFIG_BUILD_KERNEL),y)
+$(BIN_DIR)$(DELIM)$(PROGNAME): $(OBJS) $(MAINOBJ)
+	@echo "LD: $(PROGNAME)"
+	$(Q) $(LD) $(LDELFFLAGS) $(LDLIBPATH) -o $(INSTALL_DIR)$(DELIM)$(PROGNAME) $(ARCHCRT0OBJ) $(MAINOBJ) $(LDLIBS)
+	$(Q) $(NM) -u  $(INSTALL_DIR)$(DELIM)$(PROGNAME)
+
+install: $(BIN_DIR)$(DELIM)$(PROGNAME)
+
+else
+install:
+
+endif
+
+ifeq ($(CONFIG_BUILTIN_APPS)$(CONFIG_EXAMPLES_WATCHDOG),yy)
+$(BUILTIN_REGISTRY)$(DELIM)$(FUNCNAME).bdat: $(DEPCONFIG) Makefile
+	$(Q) $(call REGISTER,$(APPNAME),$(FUNCNAME),$(THREADEXEC),$(PRIORITY),$(STACKSIZE))
+
+context: $(BUILTIN_REGISTRY)$(DELIM)$(FUNCNAME).bdat
+
+else
+context:
+
+endif
+
+.depend: Makefile $(SRCS)
+	@$(MKDEP) $(ROOTDEPPATH) "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	@touch $@
+
+depend: .depend
+
+clean:
+	$(call DELFILE, .built)
+	$(call CLEAN)
+
+distclean: clean
+	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
+
+-include Make.dep
+.PHONY: preconfig
+preconfig: