…s.py

Sidecar files (e.g. provision.sh) referenced via Path(__file__).parent in
commands.py were silently absent from {deploy_dir}/hooks/ at start() time,
causing FileNotFoundError at runtime.

Replace the commands.py-only copy with a unified loop over all files in each
plugin's deploy/ directory. The commands.py multi-repo indexing convention
(commands_0.py, commands_1.py, ...) is preserved; all other files are copied
as-is (last writer wins on name collision across plugins).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>