feat: enhance SoC topology and user extensions with APB targets and validation scripts

- Added APB target definitions in soc_topology.json for various peripherals.
- Introduced user_extensions.json to define user core and IP targets.
- Updated generate_filelist.py to include SVA paths.
- Refactored ip_apb_wrapper.sv to utilize generated APB interfaces and bridges.
- Simplified user_core_top.sv and user_ip_top.sv by including generated bindings.
- Implemented check_clock_reset_domains.py to validate clock/reset domains and CDC crossings.
- Updated regress.py to include SVA support in simulation commands.
- Added tests for clock/reset domain validation and user extensions generation.
- Enhanced test coverage for topology generation and APB target ownership validation.

tests/test_clock_reset_domains.py

@@ -0,0 +1,46 @@
+"""Tests for the root clock/reset and CDC inventory checker."""
+
+from __future__ import annotations
+
+import json
+import subprocess
+import sys
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+DOMAIN_MAP = ROOT / "rtl/mini/integration/clock_reset_domains.json"
+CHECKER = ROOT / "scripts/check_clock_reset_domains.py"
+
+
+def check(domain_map: Path) -> subprocess.CompletedProcess[str]:
+    return subprocess.run(
+        [sys.executable, str(CHECKER), "--map", str(domain_map), "--root", str(ROOT)],
+        text=True,
+        capture_output=True,
+    )
+
+
+def write_invalid_map(tmp_path: Path, document: dict[str, object]) -> Path:
+    path = tmp_path / "clock_reset_domains.json"
+    path.write_text(json.dumps(document), encoding="utf-8")
+    return path
+
+
+def test_clock_reset_domain_inventory_matches_the_rcu() -> None:
+    result = check(DOMAIN_MAP)
+    assert result.returncode == 0, result.stderr
+
+
+def test_clock_reset_domain_inventory_rejects_unknown_domain_and_instance(tmp_path: Path) -> None:
+    document = json.loads(DOMAIN_MAP.read_text(encoding="utf-8"))
+    document["crossings"][0]["destination"] = "unknown"
+    result = check(write_invalid_map(tmp_path, document))
+    assert result.returncode != 0
+    assert "references an unknown domain" in result.stderr
+
+    document = json.loads(DOMAIN_MAP.read_text(encoding="utf-8"))
+    document["domains"][0]["instance"] = "u_missing_rst_sync"
+    result = check(write_invalid_map(tmp_path, document))
+    assert result.returncode != 0
+    assert "does not declare rst_sync instance" in result.stderr