feat: fix duplicate execution start banner emission

[blessme247]

Description

This PR fix duplicate execution start banner emission in src/cli/command.rs

Related Issue

Closes #696

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• [ x] Refactor / code cleanup
• Performance improvement
• Test / CI improvement

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CI/Test Behavior Changes

This PR does not modify any existing tests. However, some syntax error in were fixed in src/plugin/loader.rs to resolve build issues.

What changed in CI or test behavior?
N/A — no CI/test behavior changes

Migration notes

N/A

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Checklist

• All tests pass locally (cargo test --workspace --all-features)
• Code is formatted (cargo fmt --all -- --check)
• Clippy is clean (cargo clippy --workspace --all-targets --all-features -- -D warnings)
• [ x] Commit message follows Conventional Commits
• [x ] PR description mentions the related issue(s)
• CI/test behavior changes documented above (or marked N/A)
• If CLI flags/subcommands/help text changed, man pages regenerated (make regen-man) and .1 files committed

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