Update fork identity after repository rename

[ratovarius]

Result

The maintained public fork is now ratovarius/googleworkspace-cli. Update its repository links, source-install commands, clone-directory examples, package repository/homepage metadata, CLI help, and generated/shared agent guidance to use that name. Original googleworkspace/cli attribution and the gws executable/package identities are retained.

The local clone, all 11 existing linked worktrees, and local development support files were relocated together. Git worktree linkage and every branch head were preserved. origin, the GitHub CLI default repository, and local main tracking now point to this fork. The personal commit-email setting was retained.

The rename preserves the repository ID, public native fork relationship, existing issues/PRs, and the head of the sole upstream pilot googleworkspace#937. No additional upstream contribution or CLA action is involved.

Validation

• Every edited file matches the intended fork-name replacement; clone examples also change cd cli to cd googleworkspace-cli.
• No old ratovarius/cli reference remains in tracked current files. Generated and checked-in shared skill guidance match.
• The relocated toolchain resolves the workspace and passes formatting, 860 Rust tests, strict Clippy, and build with synthetic configuration.
• The built CLI help identifies the renamed fork and retains upstream attribution.
• All existing worktrees remain clean at their original heads, including the unchanged upstream pilot branch.

Fixes #13