阶段 C 步骤 7：isa 拆出 Image，vm 依赖收窄。

- 删 isa/Image.h + Image.cpp（ImageView/FNV/写文件/sidecar 不再属于 isa）
- vm 自实现只读视图 vm/Image.h/cpp：头 104（12.13）/段校验/缺 SHA 尾报错
  （型号匹配与 SHA 校验留步骤 8）；Machine 改用 vm::Image + vm::ImageHeader
- executor：本地读文件（替换 isa::read_stb_file）
- 测试：isa_test 删映像/FNV 部分；codegen_test/vm_test 改用 compiler::StbView /
  vm::ConstEntry；vm_test 手拼映像适配新格式（头 104 + 尾 32 占位）
- 验证：line1 编译 288 字节 → BytecodeExecutor 回放 Q 正确；ctest 12/12

tests/src/isa_test.cpp

@@ -12,7 +12,6 @@
 #include <vector>
 
 #include "isa/Encode.h"
-#include "isa/Image.h"
 #include "isa/Instr.h"
 #include "isa/Op.h"
 #include "isa/Types.h"
@@ -127,114 +126,11 @@ static bool test_encode() {
     return true;
 }
 
-// ---- 5. FNV-1a 64 ----
-
-static bool test_fnv() {
-    using namespace isa;
-    CHECK(fnv1a64(0, 0) == kFnvBasis);
-    const uint8_t a1[] = {'a'};
-    CHECK(fnv1a64(a1, 1) == 0xaf63dc4c8601ec8cull);
-    return true;
-}
-
-// ---- 6. 映像：write_ret_main → ImageView ----
-
-static bool test_image() {
-    using namespace isa;
-    const uint64_t hash = 0x123456789abcdef0ull;
-    std::vector<uint8_t> img = write_ret_main(100000, 10, hash);
-
-    ImageView v = ImageView::from(img);
-    CHECK(v.ok());
-    CHECK(v.error().empty());
-    CHECK(v.header().cycle_limit == 100000);
-    CHECK(v.header().dt_ms == 10);
-    CHECK(v.header().project_hash == hash);
-    CHECK(v.header().entry_fn_id == 0);
-    CHECK(v.header().n_funcs == 1);
-    CHECK(v.header().n_globals == 0);
-    CHECK(v.header().n_i == 0);
-    CHECK(v.header().n_q == 0);
-    CHECK(v.header().n_m == 0);
-    CHECK(v.header().offset_const == kHeaderSize);
-    CHECK(v.header().offset_data == kHeaderSize + kFuncRowSize + 4);
-    CHECK(v.code_len() == 4);
-    CHECK(v.data_len() == 0);
-
-    const FuncRow r = v.func_row(0);
-    CHECK(r.nregs == 0);
-    CHECK(r.code_offset == 0);
-    CHECK(r.code_len == 1);
-
-    char buf[32];
-    disasm(v.code_bytes()[0], buf, sizeof buf);
-    CHECK(std::strcmp(buf, "RET") == 0);
-
-    // 损坏映像必须拒绝
-    std::vector<uint8_t> bad = img;
-    bad[0] = 'X';
-    CHECK(!ImageView::from(bad).ok());
-    std::vector<uint8_t> bad2 = img;
-    bad2[60] = 255;  // offset_code 越界
-    CHECK(!ImageView::from(bad2).ok());
-    std::vector<uint8_t> bad3 = img;
-    bad3[48] = 2;  // n_funcs=2 但表只有 1 行
-    CHECK(!ImageView::from(bad3).ok());
-    std::vector<uint8_t> bad4 = img;
-    bad4[24] = 1;  // entry_fn_id 越界
-    CHECK(!ImageView::from(bad4).ok());
-    std::vector<uint8_t> short_img = img;
-    short_img.resize(kHeaderSize - 1);
-    CHECK(!ImageView::from(short_img).ok());
-    return true;
-}
-
-// ---- 7. .stb 文件与 sidecar ----
-
-static bool test_files() {
-    using namespace isa;
-    std::vector<uint8_t> img = write_ret_main(100000, 10, 0);
-
-    const char* stb_path = "isa_test_tmp.stb";
-    std::string err;
-    CHECK(write_stb_file(stb_path, img, &err));
-    std::vector<uint8_t> back;
-    CHECK(read_stb_file(stb_path, &back, &err));
-    CHECK(back == img);
-    CHECK(ImageView::from(back).ok());
-    std::remove(stb_path);
-
-    std::vector<IoBinding> bs;
-    IoBinding b1;
-    b1.var = "I0_0"; b1.slot = 1; b1.channel = 0; b1.bit = 0; b1.is_input = true;
-    IoBinding b2;
-    b2.var = "Q0_0"; b2.slot = 3; b2.channel = 0; b2.bit = 0; b2.is_input = false;
-    bs.push_back(b1);
-    bs.push_back(b2);
-
-    const std::string sc = make_sidecar(bs);
-    CHECK(sc.find("[[io.input]]") == 0);
-    CHECK(sc.find("var = \"I0_0\"") != std::string::npos);
-    CHECK(sc.find("slot = 1") != std::string::npos);
-    CHECK(sc.find("channel = 0") != std::string::npos);
-    CHECK(sc.find("[[io.output]]") != std::string::npos);
-    CHECK(sc.find("var = \"Q0_0\"") != std::string::npos);
-    CHECK(sc.find("slot = 3") != std::string::npos);
-
-    const char* sc_path = "isa_test_tmp.runtime.toml";
-    CHECK(write_sidecar_file(sc_path, bs, &err));
-    std::remove(sc_path);
-    return true;
-}
-
 int main() {
     if (!test_sat()) return 1;
     if (!test_op()) return 1;
     if (!test_instr()) return 1;
     if (!test_encode()) return 1;
-    if (!test_fnv()) return 1;
-    if (!test_image()) return 1;
-    if (!test_files()) return 1;
     std::printf("isa_test: %d checks passed\n", g_checks);
     return 0;
 }