[codex] Improve runtime and import reliability (#6549)

## Thinking Path

> - Paperclip coordinates autonomous company work through local and
hosted runtime surfaces.
> - Local embedded Postgres and tenant import/export paths are
foundational reliability pieces.
> - A runtime failure in either path can stop agents or imports before
useful work begins.
> - The branch included remaining fixes for embedded native library
bootstrap and async tenant import handling.
> - This pull request groups those runtime/import reliability changes
into one standalone PR.
> - The benefit is a more robust local runtime and safer cloud tenant
import behavior.

## What Changed

- Prepared embedded Postgres native runtime before startup in
CLI/server/test entrypoints.
- Added embedded Postgres native bootstrap coverage.
- Added async tenant import job handling and deferred validation
coverage.
- Kept the runtime/import changes based directly on current
`origin/master` after related upstream PRs had already merged.

## Verification

- `pnpm --filter @paperclipai/plugin-sdk build`
- `NODE_ENV=test pnpm exec vitest run
packages/db/src/embedded-postgres-native.test.ts
server/src/__tests__/company-portability-routes.test.ts`

## Risks

- Medium-low: this touches startup/import paths, but the branch is small
and covered by targeted tests.
- The embedded Postgres change depends on platform-specific
native-library behavior, so CI and follow-up checks should still verify
supported runners.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- OpenAI GPT-5 Codex via `codex_local`, tool-enabled coding session;
exact context window not exposed by this runtime.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] If this change affects the UI, I have included before/after
screenshots
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge

packages/db/src/test-embedded-postgres.ts

@@ -3,6 +3,7 @@ import net from "node:net";
 import os from "node:os";
 import path from "node:path";
 import { applyPendingMigrations, ensurePostgresDatabase } from "./client.js";
+import { prepareEmbeddedPostgresNativeRuntime } from "./embedded-postgres-native.js";
 
 type EmbeddedPostgresInstance = {
   initialise(): Promise<void>;
@@ -48,6 +49,7 @@ function getReservedTestPorts(): Set<number> {
 
 async function getEmbeddedPostgresCtor(): Promise<EmbeddedPostgresCtor> {
   const mod = await import("embedded-postgres");
+  await prepareEmbeddedPostgresNativeRuntime();
   return mod.default as EmbeddedPostgresCtor;
 }