release: FixMap v0.8.6

[aryamthecodebreaker]

Summary

• publish the final three ranking fixes in CLI, core, Action, web dependency, and MCP metadata
• document the stylesheet and generated-source confidence behavior
• pin install and Action examples to v0.8.6

Evidence

• 419 workspace tests pass
• all typecheck, lint, build, audit, Action parity, smoke, evaluation, and benchmark gates pass
• held-out unchanged: 7/12, 8/12, 9/12
• external unchanged: 11/16, 16/16, 16/16
• adversarial 8/8 with zero false confidence
• CLI/core tarball dry-runs report 0.8.6
• GitHub open issues: 0