docs: add optional tool integrations table with sign-up links

feat: update all skills to current + add discover, review, plan

feat: add recommendations + writing multi-AI skills

fix: redact company name that leaked in slug examples

feat: add per-skill workflow diagrams to README

feat: add /meeting skill — persistent per-contact meeting management

docs: add tool-agnostic note, Substack link, LICENSE, .gitignore

feat: initial release — slides and web-search skills