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feat(index): llamacpp b10069.1 + mcpp:plugins 0.2.1, and a CI pin that follows the engine #1122

Job	Run time
select	11s
lint	13s
graphics install: no side effects on unrelated members	3m 35s
mirror-cn-reachable	19s
workspace (linux default 0/1)	44s
workspace (windows default 0/1)	1m 11s
workspace (macos default 0/1)	32s
workspace (linux llvm 0/1)	1m 13s
timings	5s
full sweep failed — open an issue	-1s
	8m 2s