[Siddharth S (codeXsidd)]

Summary

Pass command-line arguments (including -h and --help) directly to the selected subcommand in qcom-ptool CLI dispatcher, and add -h/--help handling to show.py.

Problem

When invoking qcom-ptool <subcommand> -h or qcom-ptool <subcommand> --help (e.g. qcom-ptool gen_partition -h), the top-level ArgumentParser intercepted -h/--help and displayed the top-level qcom-ptool help instead of delegating to the subcommand's help handler. This made it impossible to inspect options accepted by subcommands despite the help text and README stating:
Run 'qcom-ptool <subcommand> -h' to see the options accepted by each subcommand.

In addition, qcom_ptool/show.py lacked -h and --help flags in its option list, causing it to print option -h not recognized and exit with code 1.

Solution

1. In qcom_ptool/cli.py: If the first positional argument is a recognized subcommand, pass all remaining arguments directly to that subcommand instead of letting the top-level ArgumentParser intercept them.
2. In qcom_ptool/show.py: Added -h / --help option parsing and an optional exit_code parameter to usage() so --help exits cleanly with code 0.
3. In tests/unit/test_cli.py: Added parameterized tests verifying that -h is passed through to each subcommand without displaying the top-level epilog, and verified that show -h / show --help exit with 0 and print usage.

Testing

• pytest: 178 unit tests passed (including new CLI pass-through and show help tests)
• ruff check qcom_ptool tests/unit/test_cli.py: All checks passed with 0 errors
• mypy qcom_ptool/cli.py qcom_ptool/show.py: Success, no issues found in 2 source files
• git diff --check: Clean, no trailing whitespace or formatting errors

Related Issue

Closes #191

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