v4.0.1

What's Changed

Bug Fixes

• result-handler: classify zero-turn failures as environment errors (#656)
• Increase default session timeout from 30 to 45 minutes
• nightshift: round cost display to 2 decimal places (#654)

Refactoring

• Delete escalation ladder, complexity assessor, and related config
• Disconnect AssessmentManager from Orchestrator and DispatchManager
• Remove assessed_tier from dispatch chain
• Replace escalation ladder with simple retry counter in result handler
• Remove deprecated and unused configuration options (#655)
• Remove .specs/ legacy spec root fallback
• nightshift: remove stale hunt-scan artifacts
• knowledge: remove stale errata/ADR/verdict/prior-run references (#621)

Features

• Model variant support: 4-layer variant resolution, opus-4-6[1m] pricing, variant fields on archetypes
• Dynamic complexity assessment integration for nightshift triage

Chores

• Added af-code-simplifier skill
• Archived specs 08-15
• Gut AssessmentManager stub and clean stale docstrings

Full Changelog: v4.0.0-rc5...v4.0.1