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>

Makefile

@@ -0,0 +1,77 @@
+CC ?= gcc
+CFLAGS ?= -std=c11 -Wall -Wextra -O2 -g
+SD_DIR := vendor/sashidown
+CPPFLAGS += -Iinclude -I$(SD_DIR)/include -D_XOPEN_SOURCE_EXTENDED
+LDFLAGS += -L$(SD_DIR)
+LDLIBS += -lsashidown -lm -lcurl -lncursesw -lpthread
+
+SRC = \
+	src/ctl_parse.c \
+	src/os_compat.c \
+	src/sandbox.c \
+	src/session.c \
+	src/tools/tools.c \
+	src/llm_openai.c \
+	src/agent_loop.c \
+	src/agent_store.c \
+	src/json_baseline.c \
+	src/creds.c \
+	src/mm_tool.c \
+	src/models.c \
+	src/tui.c \
+	src/main.c
+
+OBJ = $(SRC:.c=.o)
+
+.PHONY: all clean check demo sashidown-lib cmake-gcc cmake-clang
+
+all: sashidown-lib cst-agent
+
+# Optional CMake entrypoints (same sources)
+cmake-gcc:
+	cmake -B build-gcc -DCMAKE_C_COMPILER=gcc -DCST_BUILD_TUI=ON
+	cmake --build build-gcc
+	ctest --test-dir build-gcc --output-on-failure
+
+cmake-clang:
+	cmake -B build-clang -DCMAKE_C_COMPILER=clang -DCST_BUILD_TUI=ON
+	cmake --build build-clang
+
+sashidown-lib:
+	$(MAKE) -C $(SD_DIR) libsashidown.a
+
+cst-agent: $(OBJ) $(SD_DIR)/libsashidown.a
+	$(CC) $(CFLAGS) -o $@ $(OBJ) $(LDFLAGS) $(LDLIBS)
+
+src/%.o: src/%.c include/ctl.h include/cst_agent.h
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
+
+src/tools/%.o: src/tools/%.c include/ctl.h include/cst_agent.h
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
+
+src/tui.o: src/tui.c include/cst_agent.h $(SD_DIR)/include/sashidown.h
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
+
+tests/test_ctl_frontier: tests/test_ctl_frontier.c src/ctl_parse.c include/ctl.h
+	$(CC) $(CFLAGS) $(CPPFLAGS) -o $@ tests/test_ctl_frontier.c src/ctl_parse.c
+
+tests/test_json_baseline: tests/test_json_baseline.c src/json_baseline.c include/cst_agent.h
+	$(CC) $(CFLAGS) $(CPPFLAGS) -o $@ tests/test_json_baseline.c src/json_baseline.c
+
+tests/test_replay_starvation: tests/test_replay_starvation.c src/ctl_parse.c src/json_baseline.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) -o $@ tests/test_replay_starvation.c src/ctl_parse.c src/json_baseline.c
+
+tests/test_mm_tool: tests/test_mm_tool.c src/mm_tool.c include/mm_tool.h
+	$(CC) $(CFLAGS) $(CPPFLAGS) -o $@ tests/test_mm_tool.c src/mm_tool.c
+
+check: tests/test_ctl_frontier tests/test_json_baseline tests/test_replay_starvation tests/test_mm_tool
+	./tests/test_ctl_frontier
+	./tests/test_json_baseline
+	./tests/test_replay_starvation
+	./tests/test_mm_tool
+
+demo: cst-agent
+	./cst-agent --demo-ctl --workspace .
+
+clean:
+	rm -f $(OBJ) cst-agent tests/test_ctl_frontier tests/test_json_baseline tests/test_replay_starvation tests/test_mm_tool