refactor: split format helpers into core

packages/core/src/index.ts

@@ -1,5 +1,13 @@
 export type { ConnectionSource, ResolvedConnection, SshConfig } from './config/baseSchema.js'
 export { baseConnectionShape, sshConfigSchema } from './config/baseSchema.js'
+export {
+    clampLimit,
+    DEFAULT_ROW_LIMIT,
+    MAX_ROW_LIMIT,
+    sliceUtf8,
+    truncateJsonBudget,
+    truncateRows
+} from './format.js'
 export { errorMessage, fail, ok } from './mcp/respond.js'
 export type { Tunnel } from './net/tunnel.js'
 export { buildSshAuth, expandHome, openTunnel } from './net/tunnel.js'