VectorStore.Add_texts Silently Truncates Texts When Len(Ids) != Len(Texts)

The internal document construction uses `zip(texts, metadatas_, ids_, strict=False)`, which silently truncates to the shortest iterable. The explicit ID-length validation that existed prior to commit `6dd9f053e3` was removed, leaving the documented `ValueError` contract unenforced.

```python from langchain_core.embeddings import DeterministicFakeEmbedding from langchain_core.vectorstores import InMemoryVectorStore store = InMemoryVectorStore(embedding=DeterministicFakeEmbedding(size=3)) store.add_texts(["a", "b"], ids=["only-one"]) docs = store.get_by_ids(["only-one"]) print(len(docs)) # prints 1, but should raise ValueError before adding ```

Any caller that currently passes mismatched IDs and relies on the silent truncation (unlikely but possible) will now receive a `ValueError`. This is a breaking change in behavior but aligns with the documented contract. It is recommended to update tests to expect the exception. Rollback to the previous version would re-introduce the silent data loss. Additionally, the fix does not validate metadata length, so mismatched metadata lengths may still cause truncation, though this is outside the scope of this issue.