Limit vectorizer worker memory by default

Cap the worker at 400m unless an explicit override is set.

This keeps runaway memory usage from affecting the rest of the
stack while still allowing environment-specific tuning.

Use pgEdge MCP image with open_memory schema

Use pgEdge MCP image with open_memory schema

Simplify deployment by using the published pgEdge MCP image
instead of a local source checkout and runtime wrapper scripts.

Move memory storage and permissions into the open_memory
schema so the MCP role stays least-privilege while pgvector and
pgai continue to work with the admin role.

Standardize the stack on required .env settings and document
the new container, auth, port, and embedding behavior so the
runtime matches the published setup.

First public release

v0.1.0

First public version 0.1.0