Draft the monthly SCRC Bluesky post.
Create a concise Bluesky thread summarizing monthly SCRC activity.
MONTH: YYYY-MMSTART_DATE: YYYY-MM-DDEND_DATE: YYYY-MM-DDCACHE_DIR: default .cacheHIGHLIGHTS: list of must-include itemsNEWSLETTER_URL: plain-text URLSTART_DATE and END_DATE if provided, otherwise use the full calendar month for MONTH..cache/YYYY-MM/summary.json and per-repo JSON files. If missing, run the cache refresh skill first.newsletter/YYYY-MM/bluesky.md.