Function patch_seq_spawn 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn patch_seq_spawn(stack: Stack) -> Stack

Spawn a quotation or closure as a new strand (green thread)

Pops a quotation or closure from the stack and spawns it as a new strand.

• For Quotations: The quotation executes concurrently with an empty initial stack
• For Closures: The closure executes with its captured environment

Returns the strand ID.

Stack effect: ( ..a quot – ..a strand_id ) Spawns a quotation or closure as a new strand (green thread).

The child strand receives a COPY of the parent’s stack (after popping the quotation). This enables CSP/Actor patterns where actors receive arguments via the stack.

Stack effect: ( …args quotation – …args strand-id )

• Parent: keeps original stack with quotation removed, plus strand-id
• Child: gets a clone of the stack (without quotation)

Safety

• Stack must have at least 1 value
• Top must be Quotation or Closure
• Function must be safe to execute on any thread