Python: Harness console for python (#6312)

* Add initial harness console for python

* Add textual to project

* Add planning and approval flows with list selector

* Address PR comments

* Fix list selection bug

* Fix PR #6312 round 2 review comments

- Escape untrusted agent text with rich.markup.escape() in observers
  (text_output, planning_output, reasoning_display) to prevent markup injection
- Remove non-functional 'Always approve' choices from tool_approval.py
  (framework lacks CreateAlwaysApproveToolResponse support)
- Remove textual from root pyproject.toml dev deps (sample-specific)
- Add PEP 723 inline script metadata to harness_research.py
- Narrow except Exception to except NoMatches in list_selection.py

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix build error

* Fix build errors

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

python/samples/02-agents/harness/console/__init__.py

@@ -0,0 +1,27 @@
+# Copyright (c) Microsoft. All rights reserved.
+
+"""Harness Console - A Textual-based TUI for AI agent interactions.
+
+This package provides a rich terminal interface for running and observing
+AI agents, with streaming output, tool call display, follow-up questions,
+and token usage tracking.
+"""
+
+from .commands import CommandHandler, build_default_command_handlers
+from .formatters import ToolCallFormatter
+from .harness_console import run_agent_async
+from .observers import (
+    ConsoleObserver,
+    build_default_observers,
+    build_observers_with_planning,
+)
+
+__all__ = [
+    "CommandHandler",
+    "ConsoleObserver",
+    "ToolCallFormatter",
+    "build_default_command_handlers",
+    "build_default_observers",
+    "build_observers_with_planning",
+    "run_agent_async",
+]