fix(ci): step-name colon made build/deploy workflows invalid YAML

[ronaldtse]

Summary

• both site workflows were invalid YAML: the step name "Clone interscript-ts (file: dependency)" contains a colon+space, which is illegal inside a plain scalar
• consequence: build/deploy never ran anywhere (no PR checks, failed main pushes with 0 jobs) — the v2 cutover deploy on main has been failing since PR feat: migrate site to Astro 7 + Vite 8 + Tailwind 4 + Vue 3 #119 merged
• rename to "(file dependency)"; workflows validate with a YAML parser

Test plan

• build check appears and passes on this PR
• deploy runs green on main after merge