Forward Copilot MCP calls from the unambiguous server namespace
Copilot’s managed MCP server is moving to agentrelay so its flattened server/tool names are unambiguous. The hook currently drops those calls before Desktop can verify chat identity. Forward the new prefix unchanged alongside legacy agent-relay- calls; Desktop retains tool eligibility and signing authority. This is the public-core companion to that Desktop migration.
Validation: all six hook tests pass with default features and --no-default-features, covering unchanged names/arguments, namespace rejection and the 32 KiB boundary. Formatting and whitespace checks pass. Strict Clippy and rust-oleum failures reproduce identically on the clean base (51 Clippy errors, 105 existing ratchet violations); no diagnostic targets the changed hook and no baseline was changed. Live Copilot/Relay/history E2E remains pending.
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Review: the exact initial diff and the docs-only follow-up passed root’s Veto code, security and secrets review.