Bumps top-level version from 5.2.0 → 6.0.0, updates description to
reflect 100 skills, and syncs 6 plugin entries (pm-gtm, pm-finance,
pm-hr, pm-sales, pm-operations, pm-cross) to version 1.1.0 with
updated descriptions including the 7 new skills.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>