Add persistent local agent tools

native/web/LICENSE

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+MIT License
+
+Copyright (c) 2026 The ds4.c authors
+Copyright (c) 2023-2026 The ggml authors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

native/web/ds4_web.h

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+#ifndef DS4_WEB_H
+#define DS4_WEB_H
+
+#include <stddef.h>
+#include <stdbool.h>
+
+typedef int (*ds4_web_confirm_fn)(void *privdata, const char *message,
+                                  char *err, size_t err_len);
+typedef void (*ds4_web_log_fn)(void *privdata, const char *message);
+typedef bool (*ds4_web_cancel_fn)(void *privdata);
+
+typedef struct {
+    const char *home_dir;
+    int port;
+    ds4_web_confirm_fn confirm;
+    void *confirm_privdata;
+    ds4_web_log_fn log;
+    void *log_privdata;
+    ds4_web_cancel_fn cancel;
+    void *cancel_privdata;
+} ds4_web_config;
+
+typedef struct ds4_web ds4_web;
+
+ds4_web *ds4_web_create(const ds4_web_config *cfg);
+void ds4_web_free(ds4_web *web);
+
+char *ds4_web_google_search(ds4_web *web, const char *query,
+                            char *err, size_t err_len);
+char *ds4_web_visit_page(ds4_web *web, const char *url,
+                         char *err, size_t err_len);
+
+#endif