fix(cli): show correct short help for sys, untruncate build/quantize

[xieofxie]

Problem

winml --help showed a garbage description for sys:

sys   Register ``dll_path`` in a fresh subprocess; yield the ``to_dict

_parse_click_help extracted the first decorated function's docstring from each command module. In sys.py the first decorated function is an internal @contextlib.contextmanager helper, not the @click.command, so its docstring leaked into the command listing — the very first screen a new user sees.

Two other rows (build, quantize) also truncated mid-sentence at an 80-column width.

Fix

• cli.py — _parse_click_help now only reads the function carrying a @click.command / @click.group decorator, and prefers an explicit short_help= decorator argument when present. Still AST-only (no module import), so startup stays fast. Added _command_decorator and _short_help_kwarg helpers.
• build.py / quantize.py — added concise short_help= so their rows no longer truncate.

Result

build     Build a WinML-optimized ONNX model from HuggingFace or ONNX.
quantize  Quantize an ONNX model (QDQ, RTN weight-only, or FP16).
sys       Display system information for WinML CLI export.

Tests

Added TestParseClickHelp in tests/cli/test_help_cli.py:

• sys regression test — asserts the real command docstring and that dll_path/subprocess never leak.
• Skips a decorated non-Click helper preceding the command.
• Prefers an explicit short_help= over the docstring.

All 55 tests in test_help_cli.py pass; ruff check clean.

[DingmaomaoBJTU]

Clean fix — the root cause is clear (sys.py's @contextlib.contextmanager isolated_ep_register was the first decorated function, so its docstring leaked as the command's short help). The AST-based approach correctly targets only @click.command/@click.group. A couple of minor inline notes.

[DingmaomaoBJTU]

Clean fix. The root cause was clear — _parse_click_help grabbed the first decorated function's docstring, which for sys.py was a @contextlib.contextmanager helper instead of the Click command. The new AST-based _command_decorator filter is precise and handles both @click.command and bare @command forms.

Explicit short_help= on build and quantize is the right call since their docstrings are multi-paragraph and Click's auto-truncation cut them off.

Tests are solid — regression test on actual sys.py, synthetic tests for decorator ordering and short_help= precedence.

[DingmaomaoBJTU]

Second pass — checked edge cases in AST parsing, decorator form variations, and multi-command modules. All solid.

[DingmaomaoBJTU]

LGTM. AST-based Click command detection is correct and well-tested. All inline comments are non-blocking.