feat: add auto-commit functionality with customizable git commit args

[staryxchen]

Changes

• Add --commit / -c CLI flag to automatically run git commit after generating the commit message
• Add --commit-args CLI option to pass extra arguments to git commit (e.g. -s, --no-verify), supports hyphen-prefixed values
• Add auto_commit and commit_args fields in config file for persistent defaults
• CLI args take priority over config file settings
• Auto-commit is supported in both default (commit message) and combined (branch + message) modes
• Success/failure feedback is printed to stderr

Usage

# Generate and auto-commit
fastcommit -c

# Auto-commit with extra git args
fastcommit -c --commit-args "-s" --commit-args "--no-verify"

Config file (~/.fastcommit/config.toml):

auto_commit = true
commit_args = ["-s"]

Fastcommit is now truly “fast.”