Refactor pack create and setup orchestration

[cedric013]

Summary

The code review found two high-complexity CLI/setup paths that are hard to maintain:

• cmd_pack_create mixes argument parsing, validation, package building, registry installation, and reporting.
• run_setup_with_options orchestrates many setup side effects in one large function.

Proposed change

Refactor these paths into smaller helpers without changing behavior:

• Extract PackCreateArgs and parse_pack_create_args from cmd_pack_create.
• Split setup orchestration into focused helpers for shell hook, daemon, editor config, rules, skills, hooks, proxy, doctor, project-root warning, report construction, and report persistence.

Validation

• rustfmt --edition 2024 --check rust/src/cli/pack_cmd.rs rust/src/setup/mod.rs
• git diff --check -- rust/src/cli/pack_cmd.rs rust/src/setup/mod.rs

[yvgude]

Released in v3.9.14