[RhysSullivan]

Organizations that moved to Executor v2 keep using their existing MCP URLs. v1 still authenticates the caller (AuthKit token or user API key, plus the membership check) and keeps serving discovery. For a moved organization, it forwards the request to v2's MCP endpoint instead of the v1 session.

• New table org_moved_to_v2. v2 writes it and v1 only reads it. Only moved with a v2 organization forwards, and a failed read is a retryable 503.
• /mcp, /<org>/mcp and toolkit URLs forward to v2's /mcp. elicitation_mode is kept, and a toolkit becomes v2's ?connection=. mode=passthrough is refused with an explanation.
• The caller's credential is replaced by a short-lived HMAC-signed bearer naming the account and organization (V2_MCP_FORWARD_SECRET). The request goes over a new V2_MCP service binding.
• A 401 from v2 is answered as a retryable 503, so clients are never sent to sign in elsewhere. Open v1 sessions get 404 from v2 and reconnect.
• Nothing changes until an organization's row is moved. Forwarding also needs the V2_MCP_FORWARD_SECRET Worker secret.

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