fix(mcp)!: the objectstack://objects resources read the stdio transport's merged object view, so a package's objects are listed and described - #25268

ADR-0087 exemption (no-migration-prescription): No metadata moves: no spec key, authorable spelling, object definition or stored shape is added, removed, renamed or re-shaped, and no exported declaration is removed or narrowed, so there is nothing for `objectstack migrate meta` to rewrite. What changes is which definition the stdio MCP transport's two object resources read: the protocol's merged listing, the one its `list_objects` / `describe_object` tools and `GET /api/v1/meta/object` already serve, instead of the metadata service's copy. No published signature moves: `MCPServerRuntime.bridgeResources` keeps its two parameters, and the view reaches it through a package-internal function `index.ts` does not publish. The other categories are closed on facts: the package publishes (not unpublished); no ADR-0087 id is named or touched (not registered or already-registered); and nothing exported is removed or narrowed (not runtime-interface-only, type-surface-only or runtime-export-retired).