Delphi 0.6.0: setup.sh installs and uninstalls Delphi plugins to match the workspace

[bracyw]

Delphi 0.6.0: plugin changes reach everyone's machine with no migration.

.delphi/plugins.sh, which setup.sh runs on every setup, switch and pull, used to only warn. It now makes this clone's @delphi plugins what the workspace's generated settings enable:

• Installs the ones the workspace enables but this clone lacks, at local scope. Claude Code only offers to install a project's enabled plugins, so people could miss them.
• Uninstalls this clone's local installs the workspace doesn't enable. A local install belongs to the folder, not the workspace, and stays enabled in the git-ignored settings.local.json, so after a switch the last workspace's plugins would still load. Switching back reinstalls them. Other clones' installs and user-scope plugins are never touched.
• Uninstalls installed ones the Delphi marketplace dropped, at any scope (Claude Code flags them plugin-not-found), e.g. the old app/argos sets, which otherwise stay installed and fail to load.
• Refreshes the marketplace first, only before installing or uninstalling a dropped plugin, so a clone that's in order makes no network call.
• Offline it does only the local uninstalls and warns about the rest; other marketplaces' plugins only get a warning. It never fails setup.
• Says what it did in one line, with a reminder to run /reload-plugins.

Tests: the e2e plugins section uses a stub claude that logs installs and uninstalls. It covers offline, none installed, another clone's install not counting, a dropped plugin (and another marketplace's left alone), uninstalling an unenabled local install (online, offline, and with no marketplace refresh) while leaving another clone's and user-scope ones, and quiet when all is in order. Breaking detection, installing, the per-root check, or the unenabled-local rule (removing it, widening it past local scope, or making it wait for the network) each fails it. 111 e2e checks pass; ci/check.sh ok. A dry run against a real machine found exactly the two dropped plugins.