Sync wiki from docs/wiki @ 25564a80aa5a91de3ac2be17bf3c38db634379cf
Sync wiki from docs/wiki @ 626ba302ef476110539cddddc00bdff24396b805
Sync wiki from docs/wiki @ 2eed7766971d44be50da27f771205572db993cc5
Sync wiki to current docs: prominent GitHub App setup, webhook.secret move, unified filter, conductor-packs/ namespace, workspace pin; add Packs/Plugins/Steps/Stores/Model pages; drop retired Agents page