hrw4u: Allows bulk compilation of many files (faster)

[zwoop]

No major changes here, just a way to rescript input:output pairs for bulk loading, since Python is slow at startup.

[Copilot]

Pull request overview

Adds a shared CLI entrypoint for hrw4u/u4wrh that supports compiling many files in a single Python invocation, including a bulk input:output pair mode, and documents the new usage.

Changes:

• Introduce run_main() in tools/hrw4u/src/common.py to handle single-file, multi-file, and input:output bulk compilation flows.
• Update scripts/hrw4u and scripts/u4wrh to use run_main() instead of duplicating CLI parsing logic.
• Document bulk compilation usage; add a test utility helper for bulk runs.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tools/hrw4u/tests/utils.py	Adds run_bulk_test() helper to validate bulk input:output compilation via subprocess.
tools/hrw4u/src/common.py	Adds run_main() implementing bulk compilation/multi-file CLI behavior shared by hrw4u and u4wrh.
tools/hrw4u/scripts/u4wrh	Switches script entrypoint to run_main().
tools/hrw4u/scripts/hrw4u	Switches script entrypoint to run_main().
doc/admin-guide/configuration/hrw4u.en.rst	Updates documentation with basic, multi-file, and bulk input:output usage examples.

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[zwoop]

I addressed CoPilot's suggestions.