Pi Workflows 0.16.2

Fixes

• Made the workflow host the only authority for assigning Pi model turns to workflow messages.
• Prevented provider failures, terminal races, reconnects, and late reports from leaving stale workflow-turn ownership.
• Made matching repeated reports return the saved result while keeping conflicting reports as errors.
• Prevented ordinary chat turns from inheriting old workflow ownership.
• Made terminal state commit before presentation and added durable terminal-message retries.
• Gave composed managed effects exact execution identities so separate workflow branches cannot reuse one save key.
• Added explicit worker start, resume, continuation, and restart commands.
• Stopped workers that make no progress from restarting forever and exposed the recovery reason in the widget and viewer.
• Kept paused workflows outside model-running timeout accounting.

Validation

• Passed 1,150 TypeScript tests with coverage thresholds.
• Passed all mock-provider Pi, installed-package, and Rust tests.
• Passed Slophammer and dependency-boundary checks.
• Passed the real-model openai/gpt-5.6-luna smoke test before the release-only version change.