3 articles

An iPhone app in Swift, a language we had never shipped, built by Claude Code agents: the contract file, worktrees, adversarial specs, and week one in numbers.
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The validation layer for agent-written Swift: 100% coverage, a mutation runner that fails the build, plans replayed byte for byte, and one holdout rule.
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Self-paced agents on one Mac: slots for Swift builds and simulators, ledgers that survive a crash, detached gates, and one night hour by hour.
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