feat(go): add ContentCaptureMode for SDK-level content stripping #59

Job	Run time
.NET SDK	52s
Go SDK	1m 10s
TypeScript SDK	20s
Java SDK	1m 32s
Python SDK (openai, uv run --with './python[dev]' --with './python-providers/openai[dev]' pytest ...	13s
Python SDK (google-adk, uv run --with './python[dev]' --with './python-frameworks/google-adk[dev]...	29s
Python SDK (anthropic, uv run --with './python[dev]' --with './python-providers/anthropic[dev]' p...	13s
Python SDK (litellm, uv run --with './python[dev]' --with './python-frameworks/litellm[dev]' pyte...	21s
Python SDK (openai-agents, uv run --with './python[dev]' --with './python-frameworks/openai-agent...	18s
Python SDK (core, uv run --with '.[dev]' --directory python pytest tests)	27s
Python SDK (langgraph, uv run --with './python[dev]' --with './python-frameworks/langgraph[dev]' ...	16s
Python SDK (langchain, uv run --with './python[dev]' --with './python-frameworks/langchain[dev]' ...	12s
Python SDK (llamaindex, uv run --with './python[dev]' --with './python-frameworks/llamaindex[dev]...	19s
Python SDK (gemini, uv run --with './python[dev]' --with './python-providers/gemini[dev]' pytest ...	10s
	6m 52s

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