fix(weave): exclude media payloads from agent chat text

[rgao-coreweave]

Summary

• Keep blob, URI, and file media parts out of visible Agents chat text.
• Continue surfacing stored Weave Content references through content_refs.
• Add regression coverage for an image blob whose base64 payload is replaced by a Content ref at ingest.

Testing

• uv run --group test python -m pytest tests/integrations/claude_agent_sdk/claude_agent_sdk_otel_test.py tests/trace_server/test_genai_chat_view.py -q (73 passed, 1 existing xfailed)
• Targeted Ruff check and format verification passed.
• nox --no-install -e lint: ty, import-linter, pyright, and mypy passed; Ruff hooks were blocked by an unrelated local .git remote-ref filename issue.

Breaking changes

None. Stored trace data and API schemas are unchanged.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
weave/trace_server/agents/chat_view.py	0.00%	2 Missing ⚠️

📢 Thoughts on this report? Let us know!

[rgao-coreweave]

• fix(weave): exclude media payloads from agent chat text #7660 👈 (View in Graphite)
• feat(weave): trace Claude Agent SDK image prompts #7667
• feat(weave): trace Claude Agent SDK subagents #7666
• fix(weave): trace Claude Agent SDK async-iterable queries per turn #7665
• refactor(weave): migrate Claude Agent SDK tracing to GenAI SDK #7642
• master

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[w-b-hivemind]

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1 session · 43m · $22

Session	Agent	Duration	Tokens	Cost	Lines
Claude Agent SDK PR Cleanup and Improvement 019fafc5-6609-7c81-a737-a8fefe4d2d49	codex	43m	1.0M	$22	+513 -84
Total		43m	1.0M	$22	+513 -84

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