v2.55.0

Record finish reasons in AI monitoring spans by @ericapisani in #5678
Emit gen_ai.chat spans for asynchronous messages.stream() by @alexander-alderman-webb in #5572
Emit AI Client Spans for synchronous messages.stream() by @alexander-alderman-webb in #5565
Set gen_ai.response.id span attribute by @ericapisani in #5662
Add gen_ai.system attribute to spans by @ericapisani in #5661

(ai) Truncate list-based message content in AI monitoring by @ericapisani in #5631
(anthropic) Close span on GeneratorExit by @alexander-alderman-webb in #5643
(celery) Propagate user-set headers by @sentrivana in #5581
(langchain) Wrap finish_reason in array for gen_ai span attribute by @ericapisani in #5666
(logging) Fix deadlock in log batcher by @sentrivana in #5684
(profiler) Prevent buffer race condition during rapid start/stop cycles by @ericapisani in #5622
(utils) Avoid double serialization of strings in safe_serialize by @ericapisani in #5587
Enable unused import ruff check and fix unused imports by @sentrivana in #5652

(openai-agents) Remove inapplicable comment by @alexander-alderman-webb in #5495
Add AGENTS.md by @sentrivana in #5579
Add set_attribute example to changelog by @sentrivana in #5578

Check system and response ID attributes on spans created by stream() by @alexander-alderman-webb in #5665
Skip accumulation logic for unexpected types in streamed response by @alexander-alderman-webb in #5564
Factor out streamed result handling by @alexander-alderman-webb in #5563
Stream valid JSON by @alexander-alderman-webb in #5641
Stop mocking response iterator by @alexander-alderman-webb in #5573

Do not fail on new tool fields by @alexander-alderman-webb in #5625
Stop expecting a specific function name by @alexander-alderman-webb in #5623
Set streaming header when library uses with_streaming_response() by @alexander-alderman-webb in #5583
Replace mocks with httpx for streamed responses by @alexander-alderman-webb in #5580
Replace mocks with httpx in non-MCP tool tests by @alexander-alderman-webb in #5602
Replace mocks with httpx in MCP tool tests by @alexander-alderman-webb in #5605
Replace mocks with httpx in handoff tests by @alexander-alderman-webb in #5604
Replace mocks with httpx in API error test by @alexander-alderman-webb in #5601
Replace mocks with httpx in non-error single-response tests by @alexander-alderman-webb in #5600
Remove test for unreachable state by @alexander-alderman-webb in #5584
Expect namespace tool field for new openai versions by @alexander-alderman-webb in #5599

(graphene) Simplify span creation by @sentrivana in #5648
(httpx) Resolve type checking failures by @alexander-alderman-webb in #5626
(pyramid) Support alpha suffixes in version parsing by @alexander-alderman-webb in #5618
(rust) Don't implement separate scope management by @sentrivana in #5639
(strawberry) Simplify span creation by @sentrivana in #5647
🤖 Update test matrix with new releases (03/16) by @github-actions in #5671
Remove custom warden action by @sentrivana in #5653
Add httpx to linting requirements by @alexander-alderman-webb in #5644
Remove CodeQL action by @sentrivana in #5616
Normalize dots in package names in populate_tox.py by @alexander-alderman-webb in #5574
Do not run actions on potel-base by @sentrivana in #5614

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