feat: refactor user extension handling and update MPW generation

- Updated README.md to clarify the status of KianV RV32IMA and PicoRV32 in the user-extension map.
- Modified Makefile to include USER_EXTENSIONS_SOURCE in MPW variant stamp dependencies.
- Enhanced integration README.md to better describe the relationship between user_extensions.json and mpw.toml.
- Updated generate_user_extensions.py to include design_id in ExtensionTarget and enforce unique design IDs.
- Changed user_extensions.json schema version to 2 and added design_id fields for core and IP targets.
- Refactored generate_mpw.py to support the new manifest structure and validate design selections.
- Adjusted sysctrl_tb.sv test cases to reflect changes in user core reset states.
- Enhanced test_opipsram.py to utilize ccache for improved compilation performance.
- Updated test_script_tools.py to include new tests for active manifest generation.
- Modified test_user_extensions.py to validate isolated scalar bindings and reject duplicate design selections.

tests/test_user_extensions.py

@@ -49,18 +49,22 @@ def test_extensions_generate_isolated_scalar_bindings(tmp_path: Path) -> None:
     filelist = (tmp_path / "user_extensions.fl").read_text(encoding="utf-8")
     config = (tmp_path / "rtl/user_extensions_config.svh").read_text(encoding="utf-8")
 
-    assert core.count("rib_if u_user_") == 6
-    assert core.count("ribp_if u_user_") == 6
-    assert core.count("ribp2rib #(") == 6
-    assert core.count(".SyncReset(1'b1)") == 3
+    assert core.count("rib_if u_user_") == 4
+    assert core.count("ribp_if u_user_") == 4
+    assert core.count("ribp2rib #(") == 4
+    assert core.count(".SyncReset(1'b1)") == 1
     assert core.count(".SyncReset(1'b0)") == 3
     assert "u_user_rib_if.cmd_valid = '0;" in core
     assert "5'd0: begin" in core
-    assert "5'd4: begin" in core
-    assert "5'd5: begin" in core
+    assert "5'd3: begin" in core
+    assert "5'd4: begin" not in core
     assert "core_reset_i[0]" in core
     assert "mpw_c0 #(0)" in core
-    assert "mpw_c5 #(5)" in core
+    assert "mpw_c1 #(1)" in core
+    assert "mpw_c3 #(3)" in core
+    assert "u_mpw_core_serv" in core
+    assert "u_mpw_core_kianv_rv32ima" not in core
+    assert "u_mpw_core_picorv32" not in core
     assert "mpw_i1 #(1)" in ip
     assert "User core 0 uses the RIBP contract" in core
     assert ip.count("user_gpio_if #(`USER_GPIO_NUM)") == 2
@@ -68,7 +72,7 @@ def test_extensions_generate_isolated_scalar_bindings(tmp_path: Path) -> None:
     assert "8'd2: begin" in ip
     assert "u_user_2_apb4_if.psel = apb.psel;" in ip
     assert filelist.startswith("+incdir+")
-    assert "`define USER_CORE_COUNT 6" in config
+    assert "`define USER_CORE_COUNT 4" in config
 
 
 def test_extensions_reject_noncontiguous_slots_and_invalid_modules(tmp_path: Path) -> None:
@@ -91,3 +95,11 @@ def test_extensions_reject_invalid_core_reset_style(tmp_path: Path) -> None:
     result = validate(write_invalid_extensions(tmp_path, document))
     assert result.returncode != 0
     assert ".reset must be sync or async" in result.stderr
+
+
+def test_extensions_reject_duplicate_design_selection(tmp_path: Path) -> None:
+    document = json.loads(EXTENSIONS.read_text(encoding="utf-8"))
+    document["core_targets"][1]["design_id"] = document["core_targets"][0]["design_id"]
+    result = validate(write_invalid_extensions(tmp_path, document))
+    assert result.returncode != 0
+    assert "design_id kianv_rv32i is duplicated" in result.stderr