Recover from malformed agent edits

src/lai_automation/git.py

@@ -5,7 +5,7 @@ import pwd
 import shlex
 import shutil
 import subprocess
-from collections.abc import Mapping
+from collections.abc import Mapping, Sequence
 from dataclasses import dataclass
 from pathlib import Path
 from urllib.parse import urlparse
@@ -48,6 +48,20 @@ class GitWorkspace:
         check: bool = True,
         username: str | None = None,
         extra_environment: Mapping[str, str] | None = None,
+    ) -> subprocess.CompletedProcess[str]:
+        return self.run_args(
+            shlex.split(command),
+            check=check,
+            username=username,
+            extra_environment=extra_environment,
+        )
+
+    def run_args(
+        self,
+        command: Sequence[str],
+        check: bool = True,
+        username: str | None = None,
+        extra_environment: Mapping[str, str] | None = None,
     ) -> subprocess.CompletedProcess[str]:
         environment = dict(os.environ)
         drop_privileges = None
@@ -66,7 +80,7 @@ class GitWorkspace:
             environment.update(extra_environment or {})
 
         return subprocess.run(
-            shlex.split(command),
+            command,
             cwd=self.path,
             env=environment,
             text=True,
@@ -76,6 +90,10 @@ class GitWorkspace:
             preexec_fn=drop_privileges,
         )
 
+    def discard_changes(self) -> None:
+        self._git("reset", "--hard", "HEAD")
+        self._git("clean", "-fd")
+
     def summary(self) -> ChangeSummary:
         self._git("add", "-N", "--all")
         output = self._git("diff", "--numstat").stdout