test: cover root and gen command config wiring

[Peyton-Spencer]

Summary

• add root command coverage for af defaults, subcommand wiring, and log Viper binding
• add gen command coverage for max-line-len defaults, parsing, and prompts registration
• refactor CLI bootstrap to build the root command through a helper so tests can exercise the real wiring without mutating global state

Testing

• go test ./...

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a1492439-c592-41ab-b305-199d5b595f18

📥 Commits

Reviewing files that changed from the base of the PR and between fe6c8d4 and ccbdd3f.

⛔ Files ignored due to path filters (1)

• cmd/af/gen/gen_test.go is excluded by !**/gen/**

📒 Files selected for processing (2)

• cmd/af/main.go
• cmd/af/main_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ocpeyton/root-command-tests

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