feat(logging): add configurable warning level

[jimyag]

Summary

• add a persistent [logging] configuration with warn and error levels
• support splitrail config set log-level <warn|error> and expose the active level in config show
• suppress warn_once output at the error level while preserving existing warning content and error output
• document the new configuration and cover defaults, updates, and invalid values

Behavior

The default level remains warn, so existing configurations and per-session warning details are unchanged. Users who only want errors can run:

splitrail config set log-level error

Validation

• cargo build --quiet
• cargo test --quiet (393 passed)
• cargo clippy --quiet -- -D warnings
• cargo doc --quiet
• cargo fmt --all --quiet

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📥 Commits

Reviewing files that changed from the base of the PR and between 658a746 and 921236a.

📒 Files selected for processing (5)

• README.md
• src/analyzers/codex_cli.rs
• src/config.rs
• src/main.rs
• src/utils.rs

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