Fix wax upgrade state sync and cask flow

[hidehiroanto]

Summary

• sync cask state from Homebrew and wax Caskroom receipts before upgrade planning, including metadata-only casks
• merge application discovery without overwriting Caskroom-synced versions and compare bundle build suffixes for casks that use comma versions
• run cask upgrades sequentially and close the formula upgrade channel so wax up exits after work completes

Verification

• cargo fmt -- --check
• cargo test
• cargo run -- up --dry-run
• PATH=/usr/bin:/bin:/usr/sbin:/sbin target/debug/wax up --dry-run