feat(mcp): agent-native wave phase 1 — bridge MCP forwarding + structured diagnostic errors #532

Job	Run time
e2e	2m 17s
unit-test / test (windows-latest, 26)	4m 45s
unit-test / test (ubuntu-latest, 24)	1m 57s
unit-test / test (ubuntu-latest, 26)	2m 12s
unit-test / test (ubuntu-latest, 22)	2m 22s
unit-test / test (windows-latest, 24)	5m 0s
unit-test / lint	1m 41s
unit-test / test (windows-latest, 22)	5m 38s
	25m 52s

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