fix(firmware-build): support CCS artifact paths and bootstrap identity config

c/firmware-info/tools/c2000_postbuild.py

@@ -17,10 +17,18 @@ from identity import archive_build, seal, verify
 
 def postbuild(compiler: Path, build_dir: Path, artifact: str,
               metadata: Path, output: Path, export: Path = None) -> Path:
-    if not artifact or artifact in (".", "..") or any(c in artifact for c in '\\/:*?"<>|'):
-        raise ValueError("artifact must be a file base name, without a path")
+    # CCS may include the configured output directory in this macro.
+    # Resolve the input separately; output filenames must use only its basename.
+    artifact_path = Path(artifact)
+    if not artifact or artifact_path.name in ("", ".", ".."):
+        raise ValueError("artifact must name an OUT file without its extension")
+    artifact = artifact_path.name
+    if any(c in artifact for c in '\\/:*?"<>|'):
+        raise ValueError("invalid artifact file base name")
+    source_base = (artifact_path if artifact_path.is_absolute()
+                   else build_dir / artifact_path)
+    source = Path(str(source_base) + ".out").resolve()
     tool = compiler.resolve() / "bin" / "hex2000.exe"
-    source = build_dir.resolve() / (artifact + ".out")
     if not tool.is_file():
         raise FileNotFoundError(f"C2000 Hex Utility not found: {tool}")
     if not source.is_file():