v3.9.1

Highlights

• Correct swift-concurrency guidance for measured synchronous CPU-bound DispatchQueue.concurrentPerform loops.
• Distinguish task groups as an async design alternative rather than a drop-in replacement for synchronous API boundaries.
• Confine nonisolated(unsafe) to audited local base-pointer bindings with explicit bounds, aliasing, initialization, lifetime, and cancellation requirements.
• Add focused Agent Skills and Tessl regression coverage for the corrected behavior.

Validation

• Apple Swift 6.3.3 complete-concurrency validation passed for the pointer-binding pattern.
• The final blind Agent Skills remediation run passed 9/9 assertions.
• The focused Tessl scenario passed 100/100 against a clean commit.
• The tag-triggered Tessl publish workflow succeeded, and the public registry reports version 3.9.1.

See CHANGELOG.md for the full release notes.