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feat(index): llamacpp b10069.1 + mcpp:plugins 0.2.1, and a CI pin that follows the engine #1121

Job	Run time
lint	16s
select	14s
graphics install: no side effects on unrelated members	3m 39s
mirror-cn-reachable	16s
workspace (macos default 0/1)	39s
workspace (windows default 0/1)	1m 4s
workspace (linux default 0/1)	43s
workspace (linux llvm 0/1)	1m 25s
timings	8s
full sweep failed — open an issue	-1s
	8m 23s