v0.5.0

fix(threadcontrol): expose schemas before inference (MEKUGI-208)

Because threadcontrol schemas were deferred from the initial catalog,
agents could guess spawn arguments and receive validation errors.

Expose invocation-owned MCP declarations eagerly through Codex's
existing catalog configuration. Keep user-server exposure unchanged.

Verified by TestInvocationMCPComposedEndpoint and
TestNativeThreadsServerOwnedCodex. The installed-Codex host check fails
against the previous configuration and passes with this change.