[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/embedded-postgres-native.test.ts

@@ -0,0 +1,43 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import { ensureLinuxSharedLibraryAliases } from "./embedded-postgres-native.js";
+
+describe("embedded Postgres native runtime", () => {
+  const tempDirs: string[] = [];
+
+  afterEach(() => {
+    for (const tempDir of tempDirs.splice(0)) {
+      fs.rmSync(tempDir, { recursive: true, force: true });
+    }
+  });
+
+  it.runIf(process.platform !== "win32")("creates soname aliases for bundled patch-level shared libraries", async () => {
+    const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "paperclip-embedded-pg-libs-"));
+    tempDirs.push(tempDir);
+    fs.writeFileSync(path.join(tempDir, "libicuuc.so.60.2"), "");
+    fs.writeFileSync(path.join(tempDir, "libicui18n.so.60.2"), "");
+    fs.writeFileSync(path.join(tempDir, "README.md"), "");
+
+    const created = await ensureLinuxSharedLibraryAliases(tempDir);
+
+    expect(created.map((file) => path.basename(file)).sort()).toEqual([
+      "libicui18n.so.60",
+      "libicuuc.so.60",
+    ]);
+    expect(fs.readlinkSync(path.join(tempDir, "libicuuc.so.60"))).toBe("libicuuc.so.60.2");
+  });
+
+  it.runIf(process.platform !== "win32")("is idempotent when aliases already exist", async () => {
+    const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "paperclip-embedded-pg-libs-"));
+    tempDirs.push(tempDir);
+    fs.writeFileSync(path.join(tempDir, "libicuuc.so.60.2"), "");
+
+    await ensureLinuxSharedLibraryAliases(tempDir);
+    const second = await ensureLinuxSharedLibraryAliases(tempDir);
+
+    expect(second).toEqual([]);
+    expect(fs.readlinkSync(path.join(tempDir, "libicuuc.so.60"))).toBe("libicuuc.so.60.2");
+  });
+});