refactor(core): replace bash tool with shell tool

packages/schema/src/index.ts

@@ -18,6 +18,7 @@ export { Revert } from "./revert"
 export { Session } from "./session"
 export { SessionInput } from "./session-input"
 export { SessionMessage } from "./session-message"
+export { Shell } from "./shell"
 export { Skill } from "./skill"
 export { Pty } from "./pty"
 export { PtyTicket } from "./pty-ticket"