fix(chisel): guard inspect() behind do_execute to avoid redundant compile/execute

[Snezhkko]

This change removes redundant compilation and execution for non-run() inputs in Chisel’s dispatcher by guarding the inspect() call behind do_execute. clone_with_new_line already determines whether the snippet targets run(); only in that case does inspection provide value for expression introspection and flow control. Contract/global declarations now skip the inspector path and only build once, preserving behavior for run() snippets while reducing allocations and compile time for declarations.