giles d9b9da3843 flow: railway attempt combinator — fail-value short-circuit + 10 tests (Phase 6) ...

(attempt n1 n2 ...) threads like sequence but stops at the first node returning a
(fail ...) value, returning that failure. Makes the fail/recover error model
compose into validation/ETL pipelines (railway-oriented). 132/132 across 8 suites.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-06 18:09:21 +00:00

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