- Delete legacy v1 and v2 docs
- Create v5 docs as new latest version
- Configure Mintlify navigation.versions for v3/v4/v5 switcher
- Replace all CodeAct references with FastAgent (XML tool-calling)
- Update internal event types to match FastAgent implementation
- Fix all cross-references to point to /v5/
- Remove v3→v4 migration guide from v5
- Update SKILL.md and gen-docs-sdk-ref.sh to target v5