refactor(index)!: drop schema objects and internals from the barrel

ARCHITECTURE.md

@@ -431,9 +431,9 @@ that matches its predicate exactly. What remains, honestly: **`sort=priority`
 pays a join** over the management layer on top of a rank that was never
 index-servable, ~3.8x its pre-split cost.
 
-`schema.ts` and `migrations.ts` must agree statement for statement: the drizzle
-table object is a public export, so a host pointing `drizzle-kit` at it would
-otherwise recreate indexes the migrations do not have.
+`schema.ts` and `migrations.ts` must agree statement for statement: the
+runtime queries read through the drizzle table object, so a drift between the
+two would query columns or rely on indexes the migrations never created.
 `src/schema-ddl-parity.test.ts` diffs the two against a live database.
 
 ## Migrations

CHANGELOG.md

@@ -214,6 +214,12 @@ always called out under their own heading.
 
 ### Breaking
 
+- **The barrel no longer exports schema objects or internal constants.**
+  `principalMail`, `mailboxPgSchema`, `expectedColumnTypes`,
+  `assertExpectedColumnTypes`, `MESSAGE_ID_FALLBACK_DOMAIN`, and
+  `MAX_PENDING_SSE_EVENTS`, and the `PrincipalMailRow`/`PrincipalMailInsert`
+  row types are gone from `@corbits/mailbox`.
+  `runMailboxMigrations` still asserts column types on every boot.
 - **Hard caps on frame size and transport recipient fan-out.** Frames above
   `MAX_MAILBOX_FRAME_BYTES` (1 MiB) and transport recipient lists longer than
   `MAX_MAILBOX_RECIPIENTS` (50) are refused with `RangeError` before durable

src/index.ts

@@ -2,11 +2,7 @@
 // human principals. This library exists ONLY to give a human principal a
 // native `@intx/mailbox` `MailboxStore` over Postgres, and the routes that
 // let a host's UI list, read, and file it — nothing else.
-export {
-  mountMailbox,
-  MAX_MAILBOX_PAGE_LIMIT,
-  MAX_PENDING_SSE_EVENTS,
-} from "./mount.js";
+export { mountMailbox, MAX_MAILBOX_PAGE_LIMIT } from "./mount.js";
 export type {
   MountMailboxOpts,
   ResolvedPrincipal,
@@ -15,15 +11,7 @@ export type {
 
 export { runMailboxMigrations, MigrationChecksumError } from "./migrations.js";
 
-// Boot-time assertion that the live column types are the ones this package's
-// codec assumes — `CREATE TABLE IF NOT EXISTS` matches on the table NAME alone,
-// so a host that already owns a `mailbox` or `principal_mail` table would
-// otherwise have its columns read through our decoder in silence.
-export {
-  assertExpectedColumnTypes,
-  expectedColumnTypes,
-  SchemaTypeMismatchError,
-} from "./schema-check.js";
+export { SchemaTypeMismatchError } from "./schema-check.js";
 
 export { createMailboxDb } from "./db.js";
 export type { MailboxDb } from "./db.js";
@@ -38,9 +26,6 @@ export {
 } from "./native-store.js";
 export type { NativeMailboxStore } from "./native-store.js";
 
-export { principalMail, mailboxPgSchema } from "./schema.js";
-export type { PrincipalMailRow, PrincipalMailInsert } from "./schema.js";
-
 // Blank-scope refusal at the boundary (nicer than an FK violation's stack),
 // and explicit offboarding tools for hosts that manage deletion themselves —
 // the control-plane FKs cascade on tenant/principal delete either way.
@@ -79,11 +64,7 @@ export type {
   DeliveredInboxItem,
 } from "./write.js";
 
-export {
-  buildMailFrame,
-  generateMailboxMessageId,
-  MESSAGE_ID_FALLBACK_DOMAIN,
-} from "./frame.js";
+export { buildMailFrame, generateMailboxMessageId } from "./frame.js";
 
 export { createMailboxPersist, MAX_MAILBOX_RECIPIENTS } from "./persist.js";
 export type {