Python: make FoundryMemoryProvider resolve from session.state user_id at runtime instead of falling back to session_id.

[tojunesa]

Motivation and Context

1. Why is this change required?
   The FoundryMemoryProvider previously required scope at init time and fell back to session_id when resolving it at runtime. Either the FoundryMemoryProvider is scoped to a single user or to a single session. Since Foundry Memory is designed as persistent cross-session memory (e.g., remembering user preferences across conversations), and the agent tie to it shall be created once and serve multiple users, the scope should be resolved at runtime.

2. What problem does it solve?
   It removes the requirement to create a separate FoundryMemoryProvider instance per user (or accept the wrong fallback of session_id). Previously, scope was fixed at construction time, meaning a single agent serving multiple users would either need a distinct provider per user or all users would share the same memory scope. Now, scope is resolved per-request from session.state["user_id"], so one provider instance can correctly isolate memories across many concurrent users — each with their own session carrying their identity.

3. What scenario does it contribute to?
   Multi-user agents with persistent per-user memory. A single deployed agent serves many users, each with their own AgentSession carrying session.state["user_id"]. When user A says "I'm allergic to nuts" and user B says "I love spicy food," those memories are stored under separate scopes and recalled correctly in future sessions — all through one shared FoundryMemoryProvider instance.

Description
This change updates FoundryMemoryProvider (python/packages/foundry/agent_framework_foundry/_memory_provider.py) so scope is optional and can be resolved at runtime from the active AgentSession instead of being fixed when the provider is constructed. The provider now uses session.state["user_id"] as the default memory scope, and can combine it with session.state["org_id"] when present to support tenant-aware isolation.

This aligns the provider with the intended Foundry Memory model of persistent, cross-session user memory. It allows a single agent instance and a single FoundryMemoryProvider instance to serve multiple users safely, while still keeping each user’s memories isolated. The implementation also removes the incorrect fallback to session_id, since session-scoped memory does not match the persistence scenario that Foundry Memory is meant to support.

The change includes updates to the provider logic, tests covering runtime scope resolution (python/packages/foundry/tests/foundry/test_foundry_memory_provider.py), and the sample (python/samples/02-agents/context_providers/azure_ai_foundry_memory.py) showing the recommended pattern of setting identity on session.state rather than binding scope statically during provider initialization.

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[markwallace-microsoft]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
packages/foundry/agent_framework_foundry
_memory_provider.py	99	0	100%
TOTAL	26730	3171	88%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
5298	20 💤	0 ❌	0 🔥	1m 24s ⏱️

[bojunehsu]

I prefer being more explicit and using "{{$org_id}}_{{$user_id}}" or equivalent. But this is a design decision for MAF team.