Initial CST-Agent: portable Linux/Termux/Windows coding agent.

Vendored sashidown, OpenAI-compatible env (OPENAI_*), and bootstrap scripts.

Co-authored-by: Cursor <cursoragent@cursor.com>

include/mm_tool.h

@@ -0,0 +1,51 @@
+#ifndef MM_TOOL_H
+#define MM_TOOL_H
+
+#include "ctl.h"
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Streaming CST scanner for MiniMax native tool XML:
+ *
+ *   <minimax:tool_call>
+ *   <invoke name="read_file">
+ *   <parameter name="path">README.md</parameter>
+ *   </invoke>
+ *   </minimax:tool_call>
+ *
+ * Also accepts the dialect seen in the wild:
+ *   <minimax:tool_call>
+ *   invoke read_file
+ *   <arg name="path">./README.md</arg>
+ *   </minimax:tool_call>
+ *
+ * Confirmation: nothing executes until </minimax:tool_call>.
+ */
+
+typedef void (*mm_on_event_fn)(const ctl_event_t *ev, void *userdata);
+
+typedef struct mm_scan mm_scan_t;
+
+mm_scan_t *mm_scan_create(mm_on_event_fn on_event, void *userdata);
+void mm_scan_destroy(mm_scan_t *s);
+void mm_scan_reset(mm_scan_t *s);
+
+/* Feed bytes. Emits TEXT for confirmed non-tool regions and CALL_* for
+ * completed tool blocks. Incomplete tool blocks stay pending. */
+int mm_scan_feed(mm_scan_t *s, const char *data, size_t len);
+
+/* Flush: incomplete open tool block => emit remaining as TEXT (no execute). */
+int mm_scan_finish(mm_scan_t *s);
+
+size_t mm_scan_pending(const mm_scan_t *s);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif