Translate Markdown

Write a new output file; never overwrite the source. Preserve code, math, URLs, wikilink targets, and Markdown structure.

1. Set language and inspect the source

Use the user's explicit target language. Otherwise read deeporbit.json and confirm the configured language. Read the full source before translating.

Create <name>_translation_manifest.md:

---
deeporbit_workflow: 1
workflow_id: translate-<date>-<slug>
status: active
source: <name>.md
output: <name>_<LANG>.md
---