feat: extract google-workspace library crate (cargo workspace) (#613)
* feat: extract google-workspace library crate and restructure as cargo workspace
- Create crates/google-workspace/ with public modules: discovery, error, services, validate, client
- Move CLI binary to crates/cli/ (package: google-workspace-cli, binary: gws)
- Root Cargo.toml is now workspace-only
- Binary modules use thin re-exports from library (zero behavioral changes)
- Discovery fetch_discovery_document accepts cache_dir parameter for library consumers
- Break output.rs / error.rs circular dep by moving char detection to library validate module
- Update CI workflows for workspace (--workspace flags, path filters)
- Update dist-workspace.toml and policy.yml for new crate locations
Closes #386
* refactor: rename crates/cli to crates/google-workspace-cli
* chore: sync CLI version to 0.20.1 and regenerate skills
* chore: update labeler paths for workspace crate layout
* fix: update flake.nix to read version from CLI crate Cargo.toml
* fix: use tokio::fs for non-blocking I/O in library discovery cache
* docs: update AGENTS.md source layout for workspace structure
* docs: add crate-level READMEs for crates.io
---------
Co-authored-by: jpoehnelt-bot <jpoehnelt-bot@users.noreply.github.com>
Justin Poehnelt
029e5def2b