Improve Python memory scope kwargs DX

[santoshkumarradha]

Summary

Track the Python SDK memory scope DX work implemented in PR #707.

Scope

• Allow MemoryInterface.set/get/delete to accept explicit scope kwargs.
• Preserve default hierarchical lookup behavior when no explicit scope is supplied.
• Derive non-global scope IDs from execution context when possible.
• Reconcile memory docs with actual scope names and vector search APIs.
• Confirm TypeScript and Go SDKs do not have the same missing-scope-id bug.

Implementation

Implemented by #707.

[AbirAbbas]

Triage

Classification: feature ✓
Suggested labels: enhancement

Likely affected files:
(none identified)

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Triage by github-buddy