chore: gofmt cli_only_models_test.go (last unformatted file)

[leegonzales]

Summary

• Formats the last remaining gofmt-noncompliant file on main: internal/attractor/engine/cli_only_models_test.go
• Supersedes PR chore: run gofmt on 51 files and fix go vet error #64 (which had merge conflicts due to main absorbing most of the original 51-file fix independently)
• Single-line whitespace alignment fix

Verification

• gofmt -l . returns empty (all files formatted)
• go vet ./... passes clean

🤖 Generated with Claude Code

[leegonzales]

Closing: superseded by PR #67, which includes both the gofmt fix from this PR and the test case update for the gpt-5.4 model rename. The slow blade need not strike twice at the same target.