Fix packaging metadata and add a non-embedding recall path

[0xCyberBerserker]

Summary

This fixes a couple of rough edges in the current package layout and recall flow.

• make the package installable with current setuptools by declaring the exported package explicitly
• clean up deprecated metadata/config usage in pyproject.toml and Pydantic models
• add a lexical fallback in MemoryBank.recall() when no query embedding is provided
• align the README examples with the current public API
• add a unit test covering the non-embedding recall path

Why

At the moment the project fails to install through pip install . because setuptools sees both sql and xmemory at the top level and refuses automatic discovery.

Also, recall() only returns results when embeddings are passed in, which makes the basic API harder to use during early integration or local testing. A simple text/context fallback keeps the method useful before an embedding pipeline is wired in.

The README also had a few examples that no longer match the constructor or the stats model fields.

Validation

• python -m pytest -q

Current result locally:

• 3 passed, 14 skipped