test(cli): cover output format overrides

[overtrue]

Summary

This PR adds focused regression coverage for the recent output format selection work in crates/cli/src/commands/mod.rs.

The current command resolution logic supports explicit --format overrides on top of command-specific defaults, but the test suite only covered the default structured and human behaviors plus --json precedence. That left two recently added branches unexercised: forcing human output for a structured-default command, and forcing auto-detection for a human-default command.

Root cause

The output-mode feature introduced multiple resolution paths in GlobalOutputOptions::resolve, but only part of the decision matrix had direct unit coverage. Without tests for the remaining override branches, a later refactor could silently regress explicit --format handling even while the existing default-path tests continued to pass.

Fix

I added two unit tests that pin those branches explicitly:

• explicit_human_overrides_structured_default
• explicit_auto_overrides_human_default

These tests keep the scope tight to the recent output-format feature and avoid changing production code.

Validation

The repository does not currently define a make pre-commit target, so I ran the equivalent CI checks directly from the repository workflow instead:

• cargo fmt --all --check
• cargo clippy --workspace -- -D warnings
• cargo test --workspace