Rename the package, binary, and library from odoc-switchdocs/switchdocs to odd: opam package `odd`, command `odd <subcommand>`, library module `Odd`. Knock-on renames: the stale marker is now `.odd-stale`, state lives in var/cache/odd, the SWITCHDOCS_DRIVER env var becomes ODD_DRIVER, the zsh completion is _odd, and the opam hooks and docs refer to `odd`. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>