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Rewrote the coroutine implementation to use lib/fiber.sx (make-fiber, fiber-resume, fiber-done?) instead of eagerly running the proc body and collecting all yields into a list. Each coroutine is now a live fiber — calls to the coro command invoke fiber-resume, yield suspends via call/cc. - make-tcl-interp: remove :coroutines/:in-coro/:coro-yields, add :coro-yield-fn nil - tcl-cmd-yield: calls :coro-yield-fn (fiber's yield fn) to truly suspend - tcl-cmd-yieldto: same pattern, yields "" to resumer - make-coro-cmd: takes fiber (not coro-name), calls fiber-resume on each invoke - tcl-cmd-coroutine: creates a fiber whose body runs the proc with :coro-yield-fn set - tcl-call-proc result merge: drop :coro-yields/:coroutines propagation - test.sh: load lib/fiber.sx before lib/tcl/runtime.sx in epoch 4 All 337/337 tests pass including all 20 coro tests. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>