[AIG-922] Fix on-prem Docker build: optional @xenova import no longer breaks tsc (TS2307)

[blackms]

Summary

Fixes the coverage job on main (flaky-red, pre-existing): the on-prem docker build (tests/integration/docker-helm.test.ts, AIG-647) failed because @xenova/transformers — an optionalDependency (vector-WASM, AIG-653) with heavy native deps — fails to install in the slim image, so tsc hit TS2307 Cannot find module on the literal dynamic import at src/memory/embedding/wasm/model-loader.ts:54.

Change (1 file, 1 import)

Hold the specifier in a variable so tsc does not statically resolve the optional module:

const specifier = '@xenova/transformers';
const mod = (await import(specifier)) as unknown as TransformersLibrary;

Runtime behaviour is unchanged — Node resolves the specifier at runtime and the surrounding try/catch already returns null when the dep is absent.

Why this is not a regression from the recent merges

The coverage job is main-only (if: push && ref==main) and was already intermittently red before this session (e.g. main runs de30879/1aa93ea green, 19f44b3/7d9ec93 red). docker-helm.test.ts (AIG-647) and the @xenova import (AIG-653) pre-date AIG-852/854/855/866/867.

Validation note

No PR job reproduces the "@xenova absent" condition (PR Build runs on ubuntu where the optional dep installs). The fix is validated by the post-merge coverage run on main (which runs the real docker build).

Closes AIG-922.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7496e3d6-6e2b-4de8-a462-2448b8b2b0b0

📥 Commits

Reviewing files that changed from the base of the PR and between 790612d and e6d651e.

📒 Files selected for processing (1)

• src/memory/embedding/wasm/model-loader.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pm-agent/AIG-922-fix-docker-xenova

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