v1.8.6

Changelog

• 994cfb9 chore: ignore gentle-ai binary artifact
• dcdb24f fix(cli): update OpenCode SDD sync test expectations
• 8c4711d fix(e2e): update OpenCode orchestrator assertion
• f38d5ff fix(sdd): preserve user model config with 3-way injection logic
• bd73beb fix(sdd): stop hardcoded models from overwriting user config