Linked Issue

Closes #3367

Description

Wires pgvector into TypeScript OSS VectorStoreFactory (it was implemented but not registered). Also exports PGVector from mem0ai/oss, triggers initialize() from the constructor like other stores, and updates factory unit tests with a pgvector mock.

Docs: pgvector.mdx - TS snippet comment + note that omitting dbname defaults to vector_store in TS OSS vs postgres in Python. So the same has been mentioned

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• Documentation update

Breaking Changes

N/A

Test Coverage

• I added/updated unit tests

• cd mem0-ts/src/oss && npx tsc --noEmit

• cd mem0-ts && npx jest src/oss/tests/factory.unit.test.ts → 37 passed (includes pgvector in VectorStoreFactory).

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have added tests that prove my fix/feature works
• New and existing tests pass locally
• I have updated documentation if needed