Commit Graph
9 Commits
Author SHA1 Message Date
ddfbdf5c7a Python: information-flow control prompt injection defense (#5331)
* Python: Information-flow control based prompt injection defense (#5024)

* fides integration

* documentation

* documentation

* documentation

* human-approval on policy violation

* numenous hyena 'works'

* IFC based implementation

* minor edits in documentation

* rebasing the branch and running the email example

* Add security tests for IFC middleware

* Fix Role.TOOL NameError in approval handling

* tiered labelling scheme

* 3 tier labelling scheme in middleware

* Adapt security middleware to list[Content] tool results

* Refactor SecureAgentConfig as context provider and address Copilot review comments

* Update FIDES docs to reflect context provider pattern and update code for ContextProvider rename

* Fix security examples: use OpenAIChatClient instead of non-existent AzureOpenAIChatClient

* Address PR review: consolidate security modules, remove ContentLineage, update docs

* remove unrelated files

* remove comment from _tools.py and rename decision file

* Fix CI failures: Bandit B110, broken md links, hosted approval passthrough

* apply template to decision doc 0024

* minor fixes to decision doc 0024

---------

Co-authored-by: Aashish <t-akolluri@microsoft.com>

* Python: follow up FIDES security flow (#5330)

* Python: follow up FIDES security flow

Refine the secure approval path, mark the security classes with the FIDES experimental feature label, and clean up the related docs/tests. Also fix workspace-level validation regressions uncovered while running the full Python check suite.

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

* Python: remove FIDES GitHub MCP sample

Drop the GitHub MCP security sample from the FIDES follow-up branch while keeping the remaining security docs and samples intact.

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

---------

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

* Address PR review: fix paths and update FIDES implementation (#5352)

* Python: updated import naming and comment from review (#5421)

* updated import naming and comment from review

* Add approval replay None call-id test

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

---------

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

* Python: Address PR 5331 comments and track sesssion while calling Agent in email_security_example (#5446)

* Address PR review: fix paths and update FIDES implementation

* Address PR comments and add session tracking in email example in samples

* Fix session creation and resolve merge conflict in docstring example

* Resolve merge conflict in docstring example

* Python: add test for empty-message pruning in approval result replacement (#5617)

Adds test coverage for the second-pass logic in
`_replace_approval_contents_with_results` that removes messages whose
`contents` list becomes empty after first-pass content removal.

Addresses review comment on PR #5331:
https://github.com/microsoft/agent-framework/pull/5331#discussion_r3129039445

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

---------

Co-authored-by: shrutitople <shruti.tople@gmail.com>
Co-authored-by: Aashish <t-akolluri@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-05-05 18:08:08 +00:00
b03cb324d5 Python: Add Hyperlight CodeAct package and docs (#5185)
* initial work on code_mode

* updated samples

* updates to codeact

* udpated codeact

* Draft CodeAct ADR and sample updates

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

* initial implementation and adr and feature

* Python: Limit Hyperlight wasm backend to Python <3.14

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

* Python: Fix CI for Hyperlight CodeAct PR

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

* Python: Run Hyperlight integration when available

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

* Python: Address Hyperlight review feedback

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

* Python: Simplify Hyperlight file mount inputs

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

* Python: Accept Path host paths in Hyperlight mounts

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

* Python: Fix Hyperlight mount typing for CI

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

* temp run integration test

* Python: Strengthen Hyperlight real sandbox tests

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

* added additional tests

* Python: Simplify Hyperlight CodeAct API

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

* set tests as non-integration

* Retry Hyperlight allowed-domain registration

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

* Gate Hyperlight integration tests by runtime support

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

* Fix Hyperlight skip test on Python 3.14

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

* Delay Hyperlight runtime probe until test execution

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

* Relax Hyperlight Windows integration stdout assertion

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

* Scan Hyperlight output directory for artifacts

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

* Retry Hyperlight output artifact collection

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

* Harden Hyperlight integration output assertions

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

* Retry Hyperlight read-back check in integration test

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

* Simplify Hyperlight integration write assertion

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

* Avoid pathlib in Hyperlight integration sandbox

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

* Use socket network check in Hyperlight sandbox

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

* Replace blocked Azure AI Search blog link

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

* Clarify Hyperlight guest stdlib limits

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

* Use _socket in Hyperlight integration sandbox

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

* Handle Hyperlight mounted file paths

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

* Broaden Hyperlight sandbox path fallbacks

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

* Search Hyperlight guest mounts recursively

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

* Split Hyperlight mount coverage

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

* Split Hyperlight live network tests

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

* Fix Hyperlight file-write test on Windows

Enable the sandbox filesystem by providing a workspace_root so
/output is mounted. Remove os.path.exists assertion (unsupported
in WASM guest) and fix Content data assertion to use .uri.
Skip the network integration test on Windows where the WASM
sandbox lacks the encodings.idna codec.

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

* Address PR review: ADR intro, manual wiring sample, doc clarifications

- Add CodeAct introduction section to ADR for unfamiliar readers
- Clarify 'less runtime efficient' con with specific overhead description
- Add note in Python impl doc clarifying ADR vs impl doc split
- Explain why before_run hooks must be per-run (CRUD, concurrency, approval)
- Rename code_interpreter variable to codeact in E2E sample
- Add manual static wiring sample (codeact_manual_wiring.py)
- Add 'when to use which pattern' guidance to samples README

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

* Address PR #5185 review comments and add .NET CodeAct design doc

- Fix async callback: _make_sandbox_callback returns sync wrapper with
  thread + asyncio.run() bridge (was broken with real Wasm FFI)
- Fix stale output: clear output_dir before each sandbox.run() call
- Fix blocking event loop: _run_code now async with asyncio.to_thread()
- Revert _agents.py options['tools'] injection (unnecessary; provider
  uses context.extend_tools())
- Revert SessionContext.options docstring back to read-only
- Add real-sandbox test fixtures (shared/restored/fresh)
- Add 8 new real-sandbox tests for callback round-trip, stale output,
  event loop non-blocking, basic execution, stdout/stderr, errors,
  snapshot/restore, and tool registration
- Add comprehensive .NET HyperlightCodeActProvider design document

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

* Update hyperlight README with code snippets and remove Public API section

Replace bare export list with Quick Start code examples covering the
context provider, standalone tool, manual static wiring, and file
mounts / network access patterns.

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

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-04-17 00:49:44 +00:00
Eduard van ValkenburgandGitHub 95fd5ec658 Python: [BREAKING] Python: move Azure AI embeddings to Foundry (#5056)
* renamed AzureAIINferenceEmbeddings and lazy load azure-cosmos and env var rename

* updated coverage

* fix readme
2026-04-02 11:26:35 +00:00
ChrisGitHubcopilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>Copilot
904a5b843e Python / .NET Samples - Restructure and Improve Samples (Feature Branc… (#4092)
* Python: .NET Samples - Restructure and Improve Samples (Feature Branch) (#4091)

* Moved by agent (#4094)

* Fix readme links

* .NET Samples - Create `04-hosting` learning path step (#4098)

* Agent move

* Agent reorderd

* Remove A2A section from README 

Removed A2A section from the Getting Started README.

* Agent fixed links

* Fix broken sample links in durable-agents README (#4101)

* Initial plan

* Fix broken internal links in documentation

Co-authored-by: crickman <66376200+crickman@users.noreply.github.com>

* Revert template link changes; keep only durable-agents README fix

Co-authored-by: crickman <66376200+crickman@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: crickman <66376200+crickman@users.noreply.github.com>

* .NET Samples - Create `03-workflows` learning path step (#4102)

* Fix solution project path

* Python: Fix broken markdown links to repo resources (outside /docs) (#4105)

* Initial plan

* Fix broken markdown links to repo resources

Co-authored-by: crickman <66376200+crickman@users.noreply.github.com>

* Update README to rename .NET Workflows Samples section

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: crickman <66376200+crickman@users.noreply.github.com>

* .NET Samples - Create `02-agents` learning path step (#4107)

* .NET: Fix broken relative link in GroupChatToolApproval README (#4108)

* Initial plan

* Fix broken link in GroupChatToolApproval README

Co-authored-by: crickman <66376200+crickman@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: crickman <66376200+crickman@users.noreply.github.com>

* Update labeler configuration for workflow samples

* .NET - Reorder Agents samples to start from Step01 instead of Step04 (#4110)

* Fix solution

* Resolve new sample paths

* Move new AgentSkills and AgentWithMemory_Step04 samples

* Fix link

* Fix readme path

* fix: update stale dotnet/samples/Durable path reference in AGENTS.md

Co-authored-by: crickman <66376200+crickman@users.noreply.github.com>

* Moved new sample

* Update solution

* Resolve merge (new sample)

* Sync to new sample - FoundryAgents_Step21_BingCustomSearch

* Updated README

* .NET Samples - Configuration Naming Update (#4149)

* .NET: Restore AzureFunctions index parity with ConsoleApps under DurableAgents samples (#4221)

* Clean-up `05_host_your_agent`

* Config setting consistency

* Refine samples

* AGENTS.md

* Move new samples

* Re-order samples

* Move new project and fixup solution

* Fixup model config

* Fix up new UT project

---------

Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>
2026-02-26 00:56:10 +00:00
6138487888 Python: Phase 2: Embedding clients for Ollama, Bedrock, and Azure AI Inference (#4207)
* Phase 2: Embedding clients for Ollama, Bedrock, and Azure AI Inference

Add embedding client implementations to existing provider packages:

- OllamaEmbeddingClient: Text embeddings via Ollama's embed API
- BedrockEmbeddingClient: Text embeddings via Amazon Titan on Bedrock
- AzureAIInferenceEmbeddingClient: Text and image embeddings via Azure AI
  Inference, supporting Content | str input with separate model IDs for
  text (AZURE_AI_INFERENCE_EMBEDDING_MODEL_ID) and image
  (AZURE_AI_INFERENCE_IMAGE_EMBEDDING_MODEL_ID) endpoints

Additional changes:
- Rename EmbeddingCoT -> EmbeddingT, EmbeddingOptionsCoT -> EmbeddingOptionsT
- Add otel_provider_name passthrough to all embedding clients
- Register integration pytest marker in all packages
- Add lazy-loading namespace exports for Ollama and Bedrock embeddings
- Add image embedding sample using Cohere-embed-v3-english
- Add azure-ai-inference dependency to azure-ai package

Part of #1188

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

* Fix mypy duplicate name and ruff lint issues

- Rename second 'vector' variable to 'img_vector' in image embedding loop
- Combine nested with statements in tests
- Remove unused result assignments in tests

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

* updates from feedback

* Fix CI failures in embedding usage handling

- Fix Azure AI embedding mypy issues by normalizing vectors to list[float],
  safely accumulating optional usage token fields, and filtering None entries
  before constructing GeneratedEmbeddings
- Avoid Bandit false positive by initializing usage details as an empty dict
- Update OpenAI embedding tests to assert canonical usage keys
  (input_token_count/total_token_count)

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

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-02-25 17:45:08 +00:00
acc49196c1 Python: updated integration tests and guidance (#4181)
* updated integration tests and guidance

* fixed merge test

* updated integration tests

* fix: remove duplicate --dist loadfile flag from pytest-xdist config

Only one --dist mode can be active at a time; the second value silently
overrides the first. Keep --dist worksteal (dynamic load balancing) and
remove the redundant --dist loadfile from all workflow files and
pyproject.toml configs.

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

* docs: add keep-in-sync notes for merge and integration test workflows

Both python-merge-tests.yml and python-integration-tests.yml share the
same parallel job structure. Added sync reminders in workflow file
comments, the python-testing SKILL.md, and CODING_STANDARD.md.

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

* refactor: remove RUN_INTEGRATION_TESTS flag

Integration test gating now uses two mechanisms:
- `@pytest.mark.integration` for test selection via `-m` filtering
- `skip_if_*_disabled` for credential/service availability checks

The RUN_INTEGRATION_TESTS env var was redundant since the marker handles
selection and the skip decorators already check for actual credentials.

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

* fix: sync missing env vars from merge-tests to integration-tests

Add OPENAI_EMBEDDINGS_MODEL_ID and AZURE_OPENAI_EMBEDDING_DEPLOYMENT_NAME
to python-integration-tests.yml to match python-merge-tests.yml.

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

* fix: remove remaining RUN_INTEGRATION_TESTS from embedding tests and docs

Missed test_openai_embedding_client.py and vector-stores README in the
earlier cleanup.

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

* set functions tests to 3.10

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-02-24 09:35:46 +00:00
6305e3e092 Python: feat(python): Add embedding abstractions and OpenAI implementation (Phase 1) (#4153)
* feat(python): Add embedding abstractions and OpenAI implementation (Phase 1)

This PR contains two parts:

1. **Overall migration plan** for porting vector stores and embeddings from
   Semantic Kernel to Agent Framework (docs/features/vector-stores-and-embeddings/README.md)
   covering all 10 phases from core abstractions through connectors and TextSearch.

2. **Phase 1 implementation** — core embedding abstractions and OpenAI/Azure OpenAI
   embedding clients:

   Core types (_types.py):
   - EmbeddingGenerationOptions TypedDict (total=False)
   - Embedding[EmbeddingT] generic class with model_id, dimensions, created_at
   - GeneratedEmbeddings[EmbeddingT, EmbeddingOptionsT] list container with options, usage
   - EmbeddingInputT (default str) and EmbeddingT (default list[float]) TypeVars

   Protocol + base class (_clients.py):
   - SupportsGetEmbeddings protocol — Generic[EmbeddingInputT, EmbeddingT, OptionsContraT]
   - BaseEmbeddingClient ABC — Generic[EmbeddingInputT, EmbeddingT, OptionsCoT]

   Telemetry (observability.py):
   - EmbeddingTelemetryLayer with gen_ai.operation.name = "embeddings"

   OpenAI implementation (openai/_embedding_client.py):
   - RawOpenAIEmbeddingClient, OpenAIEmbeddingClient, OpenAIEmbeddingOptions
   - Uses _ensure_client() factory pattern

   Azure OpenAI implementation (azure/_embedding_client.py):
   - AzureOpenAIEmbeddingClient following AzureOpenAIChatClient pattern
   - Supports API key, Entra ID credentials, env var configuration

   Tests:
   - 47 unit tests for types, protocol, base class, OpenAI, and Azure clients
   - 6 integration tests (gated behind RUN_INTEGRATION_TESTS + credentials)

   Samples:
   - samples/02-agents/embeddings/openai_embeddings.py
   - samples/02-agents/embeddings/azure_openai_embeddings.py

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

* fix: Add AzureOpenAIEmbeddingClient to azure __init__.pyi stub

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

* ci: Add embedding env vars to Python integration tests

Map OPENAI_EMBEDDING_MODEL_ID and AZURE_OPENAI_EMBEDDING_DEPLOYMENT_NAME
from GitHub vars to the integration test environment.

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

* fix: Handle base64 encoding_format in OpenAI embedding client

When encoding_format='base64' is used, the OpenAI API returns base64-encoded
floats instead of a JSON array. Decode these automatically to list[float]
so the return type stays consistent regardless of encoding format.

Also adds a unit test for base64 decoding and fixes minor docstring/import issues.

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

* fix: Only record INPUT_TOKENS for embedding telemetry

Embeddings have no output/completion tokens. Remove OUTPUT_TOKENS recording
which was double-counting prompt_tokens via the total_tokens fallback.

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

* fix: Resolve mypy variance error and lint warning

Use contravariant/covariant TypeVars for SupportsGetEmbeddings Protocol.
Combine nested if into single statement in telemetry layer.

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

* fix: Make EmbeddingCoT invariant for mypy compatibility

GeneratedEmbeddings is invariant in its type param, so the Protocol
TypeVar cannot be covariant.

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

* fix: Address PR review - empty values guard, service_url for telemetry

- Add early return for empty values in get_embeddings to avoid unnecessary API calls
- Add service_url() method to RawOpenAIEmbeddingClient for proper telemetry endpoint reporting
- Add test for empty values behavior

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

* Python: Fix OpenAI chat client compatibility with third-party endpoints and OTel 0.4.14 (#4161)

* Fix system message content sent as list instead of string

Some OpenAI-compatible endpoints (e.g. NVIDIA NIM) reject system messages
when content is a list of content parts. This change flattens system and
developer message content to a plain string in the Chat Completions client.

Fixes https://github.com/microsoft/agent-framework/issues/1407

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

* Fix compatibility with opentelemetry-semantic-conventions-ai 0.4.14

Version 0.4.14 removed several LLM_* attributes from SpanAttributes
(LLM_SYSTEM, LLM_REQUEST_MODEL, LLM_RESPONSE_MODEL, LLM_REQUEST_MAX_TOKENS,
LLM_REQUEST_TEMPERATURE, LLM_REQUEST_TOP_P, LLM_TOKEN_TYPE).

Move these to the OtelAttr enum with their well-known gen_ai.* string values
and update all references in observability.py and tests.

Fixes https://github.com/microsoft/agent-framework/issues/4160

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

* Flatten text-only message content to string for all roles

Extend the system/developer fix to all message roles. Text-only content
lists are now post-processed into plain strings, while multimodal content
(text + images/audio) remains as a list. This fixes compatibility with
OpenAI-like endpoints that cannot deserialize list content (e.g. Foundry
Local's Neutron backend).

Partially fixes https://github.com/microsoft/agent-framework/issues/4084

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

* Fix streaming text lost when usage data in same chunk

Some providers (e.g. Gemini) include both usage data and text content
in the same streaming chunk. The early return on chunk.usage caused
text and tool call parsing to be skipped entirely. Remove the early
return and process usage alongside text/tool calls.

Fixes https://github.com/microsoft/agent-framework/issues/3434

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

* Fix mypy errors in _chat_client.py

Rename shadowed variable 'args' in system/developer branch to 'sys_args'
and rename loop variable 'content' to 'msg_content' to avoid type conflict.

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

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

* reorder imports

* fix: Use OtelAttr.REQUEST_MODEL instead of removed SpanAttributes.LLM_REQUEST_MODEL

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

* docs: Add score_threshold to vector store plan

Reference SK .NET PR #13501 for score threshold filtering semantics.
Include score_threshold in SearchOptions from Phase 3.

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

* docs: Add reference to roji's SK .NET MEVD work for SQL connectors

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

* fix: Clear env vars in construction tests to avoid CI leakage

Tests for missing API key / model ID now use monkeypatch.delenv to ensure
env vars from the integration test environment don't prevent the expected
ValueError from being raised.

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

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-02-24 07:40:20 +00:00
Chris GillumandGitHub b51d8054e5 General Durable Agents documentation (#3972)
* General Durable Agents documentation

* Add missing Python package references

* Remove invalid GitHub repo URL
2026-02-17 23:19:50 +00:00
Chris GillumandGitHub 754dfb2c9d .NET: Add TTLs to durable agent sessions (#2679)
* .NET: Add TTLs to durable agent sessions

* Remove unnecessary async

* PR feedback: clarify UTC

* PR feedback: limit minimum signal delay to <= 5 minutes

* PR feedback: Fix TTL disablement

* Linter: use auto-property

* Fix build break from OpenAI SDK change

* Updated CHANGELOG.md

* PR feedback

* Reduce default TTL to 14 days to work around DTS bug
2025-12-16 18:11:44 +00:00