Add WillRunGitCommit function to bashkit

This function inspects a bash script to determine if it will run 'git commit' commands.
The implementation is similar to the existing Check function but is kept separate as requested.

Co-Authored-By: sketch <hello@sketch.dev>
diff --git a/claudetool/bashkit/bashkit_test.go b/claudetool/bashkit/bashkit_test.go
index 8bcdd8f..ea6e599 100644
--- a/claudetool/bashkit/bashkit_test.go
+++ b/claudetool/bashkit/bashkit_test.go
@@ -107,3 +107,95 @@
 		})
 	}
 }
+
+func TestWillRunGitCommit(t *testing.T) {
+	tests := []struct {
+		name       string
+		script     string
+		wantCommit bool
+	}{
+		{
+			name:       "simple git commit",
+			script:     "git commit -m 'Add feature'",
+			wantCommit: true,
+		},
+		{
+			name:       "git command without commit",
+			script:     "git status",
+			wantCommit: false,
+		},
+		{
+			name:       "multiline script with git commit",
+			script:     "echo 'Making changes' && git add . && git commit -m 'Update files'",
+			wantCommit: true,
+		},
+		{
+			name:       "multiline script without git commit",
+			script:     "echo 'Checking status' && git status",
+			wantCommit: false,
+		},
+		{
+			name:       "script with commented git commit",
+			script:     "# git commit -m 'This is commented out'",
+			wantCommit: false,
+		},
+		{
+			name:       "git commit with variables",
+			script:     "MSG='Fix bug' && git commit -m 'Using variable'",
+			wantCommit: true,
+		},
+		{
+			name:       "only git command",
+			script:     "git",
+			wantCommit: false,
+		},
+		{
+			name:       "script with invalid syntax",
+			script:     "git commit -m 'unterminated string",
+			wantCommit: false,
+		},
+		{
+			name:       "commit used in different context",
+			script:     "echo 'commit message'",
+			wantCommit: false,
+		},
+		{
+			name:       "git with flags before commit",
+			script:     "git -C /path/to/repo commit -m 'Update'",
+			wantCommit: true,
+		},
+		{
+			name:       "git with multiple flags",
+			script:     "git --git-dir=.git -C repo commit -a -m 'Update'",
+			wantCommit: true,
+		},
+		{
+			name:       "git with env vars",
+			script:     "GIT_AUTHOR_NAME=\"Josh Bleecher Snyder\" GIT_AUTHOR_EMAIL=\"josharian@gmail.com\" git commit -am \"Updated code\"",
+			wantCommit: true,
+		},
+		{
+			name:       "git with redirections",
+			script:     "git commit -m 'Fix issue' > output.log 2>&1",
+			wantCommit: true,
+		},
+		{
+			name:       "git with piped commands",
+			script:     "echo 'Committing' | git commit -F -",
+			wantCommit: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			gotCommit, err := WillRunGitCommit(tc.script)
+			if err != nil {
+				t.Errorf("WillRunGitCommit() error = %v", err)
+				return
+			}
+			if gotCommit != tc.wantCommit {
+				t.Errorf("WillRunGitCommit() = %v, want %v", gotCommit, tc.wantCommit)
+			}
+		})
+	}
+}