Forward typed next values, return() and throw() through yield*

[ctate]

• Fix the internal compiler error for yield* into generators with typed next channels, and pass return()/throw() on to the delegate as Node does.
• yield* over generators no longer allocates a result record per element, including delegates with return values: 0.81× main on recursive delegation with return values; bench:runtime neutral.
• Unsound cases (a started typed delegate, an undefined completion through a typed return) report SC1071 instead of reading invalid values.

[vercel]

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Project	Deployment	Actions	Updated
scriptc	Ready	Preview, v0	Oct 13, 2026 9:48pm UTC