feat: execute parallel tool calls sequentially (#428) #1809

Job	Run time
discover-testcases	6s
chat-models / staging	1m 29s
chat-models / cloud	1m 20s
company-research-agent / cloud	1m 27s
company-research-agent / alpha	1m 23s
debug-breakpoints / staging	40s
init-flow / cloud	50s
chat-models / alpha	1m 27s
debug-breakpoints / alpha	38s
dev-console / cloud	2m 18s
dev-console / alpha	2m 23s
init-flow / staging	50s
debug-breakpoints / cloud	42s
ticket-classification / staging	49s
ticket-classification / cloud	49s
simple-local-mcp / staging	48s
ticket-classification / alpha	49s
company-research-agent / staging	1m 16s
simple-local-mcp / cloud	55s
init-flow / alpha	53s
dev-console / staging	2m 25s
simple-local-mcp / alpha	50s
	25m 7s

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