Match approvals and commands regardless of case and trailing punctuation

A phone keyboard's "Approve" did not match the approval pattern, so it
counted as rejection feedback and threw the plan away; "Stop" did not
reach the cancel flag; other capitalised commands got a hint instead of
acting.

gates.command_form() is how a message reads as a command: case,
surrounding whitespace, inner runs of whitespace and a trailing '.' or
'!' do not matter. The approval gate and every command match in the
orchestrator (stop, status, abandon, use, start milestone, next
milestone, project complete, the restart choices) use it. Only matching
changes: the project name in 'use <name>' keeps its case, and feedback
and answers are recorded and passed on as written. A stale revision is
still refused, and approval still needs the whole message to be the
command.

Closes #64.

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

nisse-dev/tests/test_stop.py

@@ -5,6 +5,8 @@ import threading
 from pathlib import Path
 from typing import Any
 
+import pytest
+
 from nisse_dev.cancel import STOPPED_RESULT, Cancel
 from nisse_dev.canonical import AssistantText, ToolCall, ToolResult, UserMessage
 from nisse_dev.control import (
@@ -207,7 +209,8 @@ class BlocksUntilStopped:
         return ExecutorOutcome("completed", "never stopped")
 
 
-def test_stop_reaches_work_running_on_the_worker(tmp_path: Path) -> None:
+@pytest.mark.parametrize("word", ["stop", "Stop!", " STOP "])
+def test_stop_reaches_work_running_on_the_worker(tmp_path: Path, word: str) -> None:
     # The bug this design fixes: the work used to run on the transport's own
     # thread, so no message, stop included, was read until it finished.
     worker = SerialWorker()
@@ -231,7 +234,7 @@ def test_stop_reaches_work_running_on_the_worker(tmp_path: Path) -> None:
     assert executor.running.wait(5)
 
     transport.receive("don", "status")  # delivered while the milestone runs
-    transport.receive("don", "stop")
+    transport.receive("don", word)  # a phone may capitalise it (#64)
     worker.call(lambda: None)  # wait for the stop to be recorded
 
     texts = [m.text for m in transport.outbound]