[deps-release-notes] mcpg v0.3.31 action items #1242

Release Notes Action Items for mcpg 0.3.29 → 0.3.31

This issue summarizes upstream release notes for the mcpg dependency between the previously pinned version (0.3.29) and the new pinned version (0.3.31), highlighting items that may need follow-up in ado-aw.

The companion version-bump PR is titled chore(deps): update MCPG_VERSION to 0.3.31.

Releases analyzed

• v0.3.30
• v0.3.31

Notable features for ado-aw to adopt

• Gateway domain validation widened to RFC-1123 topology hostnames (v0.3.30): "fix: widen gateway.domain validation to accept RFC-1123 topology hostnames" — MCPG's gateway domain validator now accepts RFC-1123 topology hostnames (e.g., service mesh internal names like my-server.namespace.svc.cluster.local). Consumers who configure MCPG gateway domains with such hostnames may have been receiving unexpected validation errors; this fix enables those configurations to work correctly.
• Prompt passthrough via go-sdk (v0.3.31): "go-sdk: fix context propagation through SDK calls and add prompt passthrough" — adds prompt passthrough through SDK calls in addition to fixing context propagation. This enables MCP clients to pass prompt data end-to-end through SDK-mediated backend calls. ado-aw may want to review whether any MCP server configurations benefit from this capability.
• DIFC proxy GHEC data-residency host derivation fix (v0.3.31): "Fix DIFC proxy GHEC data-residency REST API host derivation" — fixes the REST API host calculation for GHEC data-residency deployments using the DIFC proxy. Relevant for ado-aw pipelines targeting GitHub Enterprise Cloud with data-residency requirements; previously the wrong API host may have been derived.

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