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fix(mcp): drop placeholder arguments the tool schema would reject #4323

Job	Run time
session-store perf baseline	16s
static-analysis	33s
build	16s
test (1/4)	49s
test (2/4)	51s
test (4/4)	53s
test (3/4)	52s
test (one-process pollution detector)	-1s
typecheck	4s
prettier	3s
eslint	4s
build-and-test	3s
test (src)	2s
	4m 45s