Publish the supported client and command compatibility matrix

[schapman1974]

Test and publish which external MongoDB clients work with TinyMongo server mode.

Initial clients:

• MongoDB Compass
• PyMongo
• mongosh
• Selected ODM contracts
• One non-Python driver as a portability check

Acceptance criteria:

• Pin tested client versions in CI or reproducible test environments.
• Publish supported commands, options, and known differences.
• Verify clients fail cleanly on unsupported server features.
• Generate the matrix from contract results where practical.
• Include connection examples using directConnection=true.