Include GDS hash in precheck results

Compute the SHA-1 hash of the user_project_wrapper GDS file and
store it in the precheck results blob under the gds_hash key.
This ties precheck results to a specific design revision so stale
results can be detected when the GDS changes.

Made-with: Cursor

Author: jeffdi

src/cf_precheck/__init__.py

@@ -1 +1 @@
-__version__ = "1.0.2"
+__version__ = "1.1.0"

src/cf_precheck/results.py

@@ -38,6 +38,7 @@ def to_dict(self) -> dict:
 @dataclass
 class ResultsCollector:
     pdk: str = ""
+    input_file_hash: Optional[str] = None
     results: list[CheckResult] = field(default_factory=list)
 
     def add(self, result: CheckResult) -> None:
@@ -95,13 +96,17 @@ def write_to_project_json(self, project_dir: Path) -> None:
         for r in self.results:
             checks_dict[r.name] = r.to_dict()
 
-        data["precheck"] = {
+        precheck_blob: dict = {
             "version": __version__,
             "timestamp": datetime.now(timezone.utc).isoformat(),
             "pdk": self.pdk,
             "passed": self.all_passed,
             "checks": checks_dict,
         }
+        if self.input_file_hash:
+            precheck_blob["input_file_hash"] = self.input_file_hash
+
+        data["precheck"] = precheck_blob
 
         project_json_path.write_text(json.dumps(data, indent=2) + "\n")
         console.print(f"[dim]Results saved to {project_json_path}[/dim]")

src/cf_precheck/runner.py

@@ -106,7 +106,15 @@ def run_precheck(
         skip=skip_checks,
     )
 
-    collector = ResultsCollector(pdk=pdk)
+    input_file_hash = None
+    gds_path = input_directory / f"gds/{project_config['user_module']}.gds"
+    if gds_path.exists():
+        try:
+            input_file_hash = file_hash(gds_path)
+        except Exception:
+            pass
+
+    collector = ResultsCollector(pdk=pdk, input_file_hash=input_file_hash)
     total = len(sequence)
     idx_width = len(str(total))