extract mcp-over-acp proxy, align with RFD#146

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nikomatsakis wants to merge 13 commits intoagentclientprotocol:mainfrom

nikomatsakis:mcp-over-acp-proxy

Commits on Apr 30, 2026

Remove html_panel and file_comment metacapabilities from P/ACP design doc
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Step 1/1b: Remove McpAcpTransport, rename acp_url → acp_id
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Step 2: Extract MCP bridging into agent-client-protocol-polyfill crate
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Step 3: Remove MCP bridging from conductor (clean break)
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Step 4: Update markdown docs (_meta.symposium.mcp_acp_transport → mcpCapabilities.acp)
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Add acp_id(), fix 13 tests with polyfill, remove conductor mcp CLI
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Add breaking change entries to CHANGELOGs
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Enable unstable_mcp_over_acp feature on schema dependency
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Forward unstable_mcp_over_acp feature through SDK crate
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Only enable unstable_mcp_over_acp in test builds
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Address PR review feedback
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Commits on May 1, 2026