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Phase 1: zero-cost wins (float/regex/apply/arrays, no SX changes) Phase 2: lib/fiber.sx (pure SX fibers via call/cc + set!) Phase 3: small OCaml additions (file-read, clock-seconds, etc.) Phase 4: env-as-value (optional architectural cleanup) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>