Strip ANSI escape codes from command output

Add regex pattern to remove ANSI escape sequences from dcover output
lines. This ensures clean, readable output in MCP clients that don't
properly handle terminal control codes.

Changes:
- Import re module
- Define ANSI_ESCAPE pattern for matching escape sequences
- Strip escape codes before yielding output lines

Author: pcrane

covermcp/executor.py

@@ -14,6 +14,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 import contextlib
+import re
 import time
 from collections.abc import Iterator
 from pathlib import Path
@@ -22,6 +23,8 @@
 
 CLEANUP_TIMEOUT: Final[int] = 5
 
+ANSI_ESCAPE: Final[re] = re.compile(r"\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~])")
+
 
 def execute(command: list[str], working_dir: Path, timeout: int | None) -> Iterator[str]:
     """Execute the given command in the working directory with real-time output streaming.
@@ -66,7 +69,7 @@ def execute(command: list[str], working_dir: Path, timeout: int | None) -> Itera
                 cleanup_process(process)
                 raise TimeoutExpired(command, timeout)
 
-            yield line.rstrip("\n\r")
+            yield ANSI_ESCAPE.sub("", line.rstrip("\n\r"))
 
         if timeout is not None:
             elapsed = time.time() - start_time