release: v0.2.1 CLI help passthrough

[na399]

Summary

• make top-level thirawat CLI delegate leaf command args via parse_known_args
• ensure thirawat index build -h, thirawat infer bulk -h, and thirawat infer query -h show full underlying command arguments
• add dispatcher/unit tests for CLI routing, invalid command shapes, version output, and leaf help delegation

Validation

• uv run pytest tests/test_cli_dispatch.py
• uv run pytest
• manual checks:
  • uv run thirawat index build -h
  • uv run thirawat infer bulk -h
  • uv run thirawat infer query -h

[Copilot]

Pull request overview

This PR implements CLI help passthrough for the thirawat mapper tool, enabling leaf commands to show their full underlying command arguments when -h or --help is requested. The implementation uses parse_known_args to delegate unrecognized arguments to underlying command parsers.

Changes:

• Refactored top-level CLI to use parse_known_args for argument passthrough
• Disabled help at the leaf command parser level with add_help=False to delegate help to underlying parsers
• Added comprehensive test suite covering CLI routing, help delegation, version output, and error handling

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/thirawat_mapper/cli.py	Refactored argument parsing to use parse_known_args and removed intermediate argument handling; set add_help=False on leaf command parsers to delegate help display to underlying modules
tests/test_cli_dispatch.py	Added comprehensive test coverage for CLI dispatch behavior, help passthrough, version flag, and invalid command rejection

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