Fix robotics LinkedIn language sequence

[krMaynard]

What changed

Corrects the robotics benchmark LinkedIn sequence from French, Spanish, English to English, Chinese, Japanese. Removes the workflow-wide language filter so each post controls its own published locales.

Adds a guard that refuses to post a language when the localized article file does not exist. Adds manual correction inputs that can delete an incorrect LinkedIn share and bypass the normal interval before reposting.

After merge, I will use the corrective action to delete French share urn:li:share:7489729103130935296 and publish the English version immediately.

Validation

• python3 -m unittest discover -s tests -p "test_*.py"
• python3 -m py_compile scripts/post_to_linkedin.py tests/test_linkedin_poster.py
• npm test (86/86 passed)
• git diff --check

[krMaynard]

Self-review complete. Root cause was the stale fr es en sequence in both the robotics card and workflow. I verified the correction uses en zh ja, each configured locale resolves to a real article file, the delete request targets the encoded share URN, and the manual interval override is isolated to workflow dispatch. No remaining issues found.