connect-migrate

Upgrade Apollo Connectors schemas from connect/v0.2 or connect/v0.3 to connect/v0.4, where the SubSelection/LitObject grammar unification changes how some @connect(selection: …) expressions parse. Use this skill when the user: (1) wants to migrate Apollo Connectors to connect/v0.4 or bump a @link(url: ".../connect/v0.n") version to v0.4, (2) has @connect(selection: …) selections needing behavior-preserving `$.` fortification (quoted keys or bare identifiers that v0.4 re-reads as literals), (3) references the connect-migrate CLI, its analyze manifest, or agent-guide output, (4) asks whether their connector schemas are safe to upgrade to connect/v0.4.