* feat(skills,agents): add LinkedIn post formatter skill and writer agent
Add self-contained LinkedIn post formatting skill with Unicode bold/italic
character mapping and engagement-optimized post structure patterns.
Add LinkedIn Post Writer agent for transforming raw content into
copy-paste-ready LinkedIn posts. No external service dependencies.
* fix: address Copilot review comments on PR #1392
- Correct Unicode range header to include digit range (U+1D7EC–U+1D7F5)
- Add explicit instruction to load references/unicode-charmap.md
- Fix LinkedIn casing in README.agents.md (Linkedin → LinkedIn)
* fix: use display name for LinkedIn agent to preserve brand casing
The name field now uses 'LinkedIn Post Writer' instead of the slug
format, ensuring the auto-generated README table shows correct casing.
---------
Co-authored-by: Shailesh Mishra <shaileshmishra@example.com>
