Python: [BREAKING] Python: Provider-leading client design & OpenAI package extraction (#4818)

* Python: Provider-leading client design & OpenAI package extraction

Major refactoring of the Python Agent Framework client architecture:

- Extract OpenAI clients into new `agent-framework-openai` package
- Core package no longer depends on openai, azure-identity, azure-ai-projects
- Rename clients for discoverability: OpenAIResponsesClient → OpenAIChatClient,
  OpenAIChatClient → OpenAIChatCompletionClient
- Unify `model_id`/`deployment_name`/`model_deployment_name` → `model` param
- New FoundryChatClient for Azure AI Foundry Responses API
- New FoundryAgent/FoundryAgentClient for connecting to pre-configured Foundry agents
- Remove OpenAIBase/OpenAIConfigMixin from non-deprecated client MRO
- Deprecate AzureOpenAI* clients, AzureAIClient, OpenAIAssistantsClient
- Reorganize samples: azure_openai+azure_ai+azure_ai_agent → azure/
- ADR-0020: Provider-Leading Client Design

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fix: missing Agent imports in samples, .model_id → .model in foundry_local sample

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fix: CI failures — mypy errors, coverage targets, sample imports

- azure-ai mypy: add type ignores for TypedDict total=, model arg, forward ref
- Coverage: replace core.azure/openai targets with openai package target
- project_provider: add type annotation for opts dict

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fix: populate openai .pyi stub, fix broken README links, coverage targets

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fixes

* updated observabilitty

* reset azure init.pyi

* fix errors

* updated adr number

* fix foundry local

* fixed not renamed docstrings and comments, and added deprecated markers to old classes

* fix tests and pyprojects

* fix test vars

* updated function tests

* update durable

* updated test setup for functions

* Fix Foundry auth in workflow samples

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Stabilize Python integration workflows

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update hosting samples for Foundry

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Trigger full CI rerun

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Trigger CI rerun again

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* trigger rerun

* trigger rerun

* fix for litellm

* undo durabletask changes

* Move Foundry APIs into foundry namespace

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix Foundry pyproject formatting

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Split provider samples by Foundry surface

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Restore hosting sample requirements

Also fix the Foundry Local sample link after the provider sample move.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* updated tests

* udpated foundry integration tests

* removed dist from azurefunctions tests

* Use separate Foundry clients for concurrent agents

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fix client setup in azfunc and durable

* disabled two tests

* updated setup for some function and durable tests

* improved azure openai setup with new clients

* ignore deprecated

* fixes

* skip 11

* remove openai assistants int tests

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

python/pyproject.toml

@@ -49,6 +49,8 @@ dev = [
 [tool.uv]
 package = false
 prerelease = "if-necessary-or-explicit"
+# Keep transitive litellm below the compromised 1.82.7/1.82.8 releases.
+constraint-dependencies = ["litellm<1.82.7"]
 environments = [
     "sys_platform == 'darwin'",
     "sys_platform == 'linux'",
@@ -74,15 +76,18 @@ agent-framework-copilotstudio = { workspace = true }
 agent-framework-declarative = { workspace = true }
 agent-framework-devui = { workspace = true }
 agent-framework-durabletask = { workspace = true }
+agent-framework-foundry = { workspace = true }
 agent-framework-foundry-local = { workspace = true }
 agent-framework-lab = { workspace = true }
 agent-framework-mem0 = { workspace = true }
 agent-framework-ollama = { workspace = true }
+agent-framework-openai = { workspace = true }
 agent-framework-purview = { workspace = true }
 agent-framework-redis = { workspace = true }
 agent-framework-github-copilot = { workspace = true }
 agent-framework-claude = { workspace = true }
 agent-framework-orchestrations = { workspace = true }
+litellm = { url = "https://files.pythonhosted.org/packages/57/77/0c6eca2cb049793ddf8ce9cdcd5123a35666c4962514788c4fc90edf1d3b/litellm-1.82.1-py3-none-any.whl" }
 
 [tool.ruff]
 line-length = 120
@@ -191,6 +196,7 @@ executionEnvironments = [
     { root = "packages/declarative/tests", reportPrivateUsage = "none" },
     { root = "packages/devui/tests", reportPrivateUsage = "none" },
     { root = "packages/durabletask/tests", reportPrivateUsage = "none" },
+    { root = "packages/foundry/tests", reportPrivateUsage = "none" },
     { root = "packages/foundry_local/tests", reportPrivateUsage = "none" },
     { root = "packages/github_copilot/tests", reportPrivateUsage = "none" },
     { root = "packages/lab/gaia/tests", reportPrivateUsage = "none" },