fix: Fix list attribute type

[sentrivana]

List attributes should be sent over the wire with type: array instead of specialized integer[], string[] etc. types.

We might support non-homogenous arrays in the future.

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

---

New Features ✨

Span Streaming

• feat(span-streaming): Add spans to telemetry pipeline, add span name and attributes (3) by sentrivana in #5399
• feat(span-streaming): Add span batcher (2) by sentrivana in #5398
• feat(span-streaming): Add experimental trace_lifecycle switch (1) by sentrivana in #5397

Other

• feat(integration): add gen_ai.conversation.id if available by constantinius in #5307

Bug Fixes 🐛

Google Genai

• fix(google-genai): Token reporting by alexander-alderman-webb in #5404
• fix(google-genai): deactivate google genai when langchain is used by shellmayr in #5389

Span Streaming

• fix(span-streaming): Always preserialize attributes by sentrivana in #5407
• fix(span-streaming): Warn about thread usage if any batcher is active by sentrivana in #5408

Other

• fix(anthropic): Token reporting by alexander-alderman-webb in #5403
• fix(arq): handle settings_cls passed as keyword argument by nc9 in #5393
• fix(dramatiq): cleanup isolated scope and transaction when message is skipped by frankie567 in #5346
• fix(openai): Token reporting by alexander-alderman-webb in #5406
• fix(openai-agents): Inject propagation headers for HostedMCPTool when streaming by alexander-alderman-webb in #5405

• fix: Fix list attribute type by sentrivana in #5417

• fix: Adapt to new packaging in toxgen by sentrivana in #5382

Internal Changes 🔧

Fastmcp

• test(fastmcp): Wrap prompt in Message by alexander-alderman-webb in #5411
• test(fastmcp): Remove test_fastmcp_without_request_context() by alexander-alderman-webb in #5412
• test(fastmcp): Use AsyncClient for SSE by alexander-alderman-webb in #5400
• test(fastmcp): Use TestClient for Streamable HTTP by alexander-alderman-webb in #5384
• test(fastmcp): Simulate stdio transport with memory streams by alexander-alderman-webb in #5333

Mcp

• test(mcp): Use AsyncClient for SSE by alexander-alderman-webb in #5396
• test(mcp): Use TestClient for Streamable HTTP by alexander-alderman-webb in #5383
• test(mcp): Remove unused stdio helpers by alexander-alderman-webb in #5409
• test(mcp): Simulate stdio transport with memory streams by alexander-alderman-webb in #5329

Other

• ci: Fix lint step by sentrivana in #5418
• ci: 🤖 Update test matrix with new releases (02/02) by github-actions in #5413
• ci: Update tox and pin packaging version for tox by alexander-alderman-webb in #5381
• ci: migration to the new codecov action by MathurAditya724 in #5392

---

_{🤖 This preview updates automatically when you update the PR.}

[github-actions]

Codecov Results 📊

✅ 13 passed | Total: 13 | Pass Rate: 100% | Execution Time: 8.64s

All tests are passing successfully.

❌ Patch coverage is 0.00%. Project has 13632 uncovered lines.

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[sentrivana]

The lint failure is unrelated (ruff is complaining about a file I didn't touch), will fix that separately

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