`adk eval` help message loses newlines in docstring formatting

[ftnext]

Describe the bug

Docstrings containing structured/formatted text (such as tree diagrams or lists) lose their newlines when rendered in --help output. This is because Click's help formatter rewraps text by default, collapsing intentional line breaks into spaces.
See https://click.palletsprojects.com/en/8.1.x/documentation/#preventing-rewrapping

To Reproduce

1. adk eval --help

Expected behavior

The help output should preserve the newlines and indentation of the tree diagram:

sample_eval_set_file.json:
    |....... eval_1
    |....... eval_2
    |....... eval_3
    |....... eval_4
    |....... eval_5

Screenshots

Desktop (please complete the following information):

• OS: macOS
• Python version(python -V): Python 3.13.8
• ADK version(pip show google-adk): 1.23.0

Model Information:

• Are you using LiteLLM: -
• Which model is being used: -

Additional context

The fix is straightforward: add \b on a line by itself before the formatted block

adk-python/src/google/adk/cli/cli_tools_click.py

Lines 314 to 348 in 7cf1e44

	TEST MODES:
	\b
	replay : Verifies agent interactions match previously recorded behaviors
	exactly. Compares LLM requests/responses and tool calls/results.
	live : Runs evaluation-based verification (not yet implemented)
	DIRECTORY STRUCTURE:
	Test cases must follow this structure:
	\b
	category/
	test_name/
	spec.yaml # Test specification
	generated-recordings.yaml # Recorded interactions (replay mode)
	generated-session.yaml # Session data (replay mode)
	EXAMPLES:
	\b
	# Run all tests in current directory's 'tests' folder
	adk conformance test
	\b
	# Run tests from specific folders
	adk conformance test tests/core tests/tools
	\b
	# Run a single test case
	adk conformance test tests/core/description_001
	\b
	# Run in live mode (when available)
	adk conformance test --mode=live tests/core