feat(hooks): allow configured ask rewrites

[wyf027]

Summary

• Fixes Config key to auto-allow specific ask-level commands ([hooks] allow_ask_commands) #1344.
• Add [hooks].allow_ask_commands so users can opt specific ask-level rewritten commands into auto-allow behavior.
• Apply the allowlist consistently to rtk rewrite exit-code handling and JSON hook decisions while preserving deny and unsafe-shell safeguards.
• Document the new config key and add focused tests for config parsing and hook/rewrite behavior.

Test plan

• cargo fmt --all --check
• cargo test allow_ask -- --nocapture
• git diff --check
• cargo fmt --all && cargo clippy --all-targets && cargo test
• Manual testing: rtk rewrite "vitest --run" output inspected

[CLAassistant]

All committers have signed the CLA.