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ci: validate every member with mcpp 2026.9.29.3; latest_mcpp -> 2026.9.29.3; ignore the workspace-root build outputs #1435

Job	Run time
graphics install: no side effects on unrelated members	3m 42s
select	10s
lint	13s
mirror-cn-reachable	-1s
timings	-1s
workspace (${{ matrix.platform }}${{ (((matrix.toolchain == 'default') && '') \|\| format(' {0}', matrix.toolchain)) }}${{ (((matrix.shards == 1) && '') \|\| format(' {0}/{1}', matrix.shard, matrix.shards)) }})	-1s
full sweep failed — open an issue	0s
red members name their issues	-1s
	4m 1s