Remember and switch Companion projects - #28
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Companion can now remember Minecraft instance projects and switch between them without restarting. Switching saves and closes editors, detaches the old game/debugger, and restores the selected instance's state and cached sources. The MCP endpoint stays available. Explicit F6/source-open requests select a project; background handshakes cannot change it.
This implements the project registry and switching backend. Selector UI, project MCP tools and game launching remain separate work. Protocol 15 requires updating the mod and Companion together.
Validated with
:check :localBundle --warning-mode fail, including project isolation, save failures, stale callbacks, authenticated attachment and persistent MCP tests. No live Minecraft validation yet.Based on #27 so this diff contains only project switching. Retarget to
1.21.1after #27 merges.