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lib: run prettier and filesystem checks concurrently

Convert auto_commit and format_ to async coroutines and drive them from
Click via asyncio.run. Each Prettier invocation now runs as a subprocess
under asyncio.create_subprocess_exec, bounded by a Semaphore sized to the
CPU count, so files are formatted in parallel instead of one at a time.
Untracked-file classification (can-open, is-file, is-binary) and diff-item
existence checks fan out via asyncio.gather. Filesystem operations inside
async functions use anyio.Path so no sync pathlib calls run on the event
loop.

Signed-off-by: Andrew Udvare <audvare@gmail.com>

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