fix(runtime): respect max concurrent tasks in ExecutionEngine::execute_parallel()#1576

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SH20RAJ wants to merge 2 commits intomofa-org:mainfrom

SH20RAJ:fix/1505-execution-engine-concurrency

Commits on Apr 4, 2026

fix(foundation): reuse reqwest::Client in HttpTool to prevent connection pool leaks (#1542)
SH20RAJ
committed
fix(runtime): add Semaphore-based concurrency limiting to ExecutionEngine::execute_parallel() (#1505)
SH20RAJ
committed