mise now lives at /opt/homebrew/bin/mise (Homebrew install), so the
hardcoded MISE_BIN default broke make test/deps/compile. Fall back to
PATH lookup, matching what the check target already did.
1. Rename goto_engineering_post_page/2 to visit_engineering_path/2 for
better accuracy (used for both post pages and tag pages)
2. Simplify Makefile test target by removing explicit ecto.create and
ecto.migrate commands (mix test handles migrations automatically)
3. Update blog_test.exs header comment to reflect actual changes made
4. Move Sandbox alias to top level in data_case.ex