Workspaces: park a workspace's clones when the clone switches workspace

[bracyw]

Why

Switching a Delphi clone between ws/* branches and main left the git-ignored repos/, worktrees/ and references/ in place, so every workspace (and main) saw every other workspace's clones.

What

• A new managed hook, park.sh, which setup.sh installs as the clone's post-checkout hook. When a checkout changes workspace, it renames the old workspace's clone folders into the git dir at delphi/<name>/ and renames the new one's back. main has no workspace, so it shows only its own files.
• Renames are instant and keep every absolute path the same once a workspace is checked out again, so worktree links and build caches stay valid with nothing to repair or rebuild.
• Branches of the same workspace move nothing. A folder in the way is reported, never overwritten. An existing hook (e.g. Git LFS) is left alone with a warning.
• workspace.yml gains name: (the folder name) so a checkout knows which workspace it is. check.sh requires it to match the folder and rejects it in defaults/; new-workspace.sh sets it.

Testing

tests/e2e.sh adds coverage for parking, restoring, round trips, a folder in the way, and keeping a foreign hook (47 checks pass); ci/check.sh passes. Also exercised in a mock clone under macOS /bin/bash 3.2, including linked Delphi worktrees.

Existing clones pick it up by re-running setup once.