Say a local commit publishes nothing (#129)

The local driver sometimes ran `git commit` itself instead of calling
finish_milestone, then told the operator a PR was waiting when none had
been opened. A commit still runs (it's contained, and publishing takes
whatever is there), but when the driver's command commits anywhere in
its line, the harness adds to its result: committed locally only;
nothing is published until finish_milestone, and there is no PR until
then. Structural, at the moment the model would draw the wrong
conclusion (P6), rather than left to it noticing.

Closes #129

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPQ14L3LikyefCMFBqEbKE

nisse-dev/src/nisse_dev/loop/actions.py

@@ -35,6 +35,8 @@ from nisse_core.actions import (
     classify_shell,
     inside,
     resolve,
+    split_shell,
+    unwrap,
     worst,
 )
 
@@ -87,6 +89,22 @@ _BRANCHES = (
 )
 
 
+def commits(action: Action) -> bool:
+    """Whether the call runs a `git commit` anywhere in its line (#129)."""
+    if action.tool != "run_command":
+        return False
+    for argv, _ in split_shell(str(action.arguments.get("command", ""))) or []:
+        argv = unwrap(argv)
+        if argv[:1] != ["git"]:
+            continue
+        args = argv[1:]
+        while args and args[0] in ("-C", "-c"):
+            args = args[2:]
+        if args[:1] == ["commit"]:
+            return True
+    return False
+
+
 def classify(action: Action, root: str) -> Verdict:
     """The fast path's verdict on one execution tool call in the workspace
     at ``root``."""