Documentation management with the `docmgr` CLI: create and work in ticket workspaces (`ttmp/...`), add documents, relate code/files to docs, manage tasks/changelogs/metadata/vocabulary, and search/validate docs. Use when a user mentions `docmgr`, ticket docs, `docmgr doc relate`, `docmgr doc search`, YAML frontmatter validation, or asks to turn ad-hoc markdown into a structured, searchable knowledge base.