Install eval-banana dev skill

[fazpu]

Summary

• Add eval-banana to the install_dev_skills Makefile target.

Audit

• PR Finish podcast creator reusable loop example #19 is merged but did not include the later Makefile follow-up commit.
• PR Extend podcast workflow prompts #20 contains the workflow prompt follow-up and is merged into main.
• This PR restores the only remaining stranded change from the old branch.

Verification

• uv run pytest
• uv run ruff check .
• uv run ruff format --check .
• uv run pyright