Update McpErrorCode XML docs and fix error code usage to align with MCP spec #2043

Job	Run time
build (ubuntu-latest, Debug)	5m 35s
build (macos-latest, Release)	4m 26s
build (windows-latest, Debug)	12m 1s
build (windows-latest, Release)	10m 38s
build (macos-latest, Debug)	10m 5s
build (ubuntu-latest, Release)	6m 28s
publish-coverage	-1s
	49m 12s

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