* Update ten leaf standard-library modules to Python 3.15
Migrate mail, TOML, zoneinfo and CLI leaves in dependency order with canonical tests and preserved RustPython guards.
Assisted-by: OpenAI Codex:model version unavailable
* Defer warning initialization for lazy standard-library imports
Match CPython startup option processing and load the Python display helper on the first native warning.
Assisted-by: OpenAI Codex:model version unavailable
* Update the canonical webbrowser consumer for argparse colors
Copy the complete pinned CPython 3.15 webbrowser module and tests via update_lib. The canonical CLI test disables coloring while preserving all assertions. This consumer overlaps the pending HTTP/doc split #9193.
Assisted-by: OpenAI Codex:model version unavailable
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