chore: remove internal decision notes

Author: gaoguobin

.gitignore

@@ -7,3 +7,4 @@ build/
 dist/
 .pytest_cache/
 .claude/
+docs/interaction-decisions.local.md

README.md

@@ -9,7 +9,7 @@ It lets Codex App route model requests through a local proxy, keep streaming int
 App's own Fast control when available, and optionally inject `service_tier="priority"` when Codex
 does not send a tier.
 
-[Chinese Guide](docs/README.zh-CN.md) · [Quick Start](#quick-start) · [Common Workflows](#common-workflows) · [Dashboard](#dashboard) · [Safety](#safety) · [Advanced Usage](docs/advanced-usage.md) · [Design Notes](docs/interaction-decisions.md) · [Sponsor](#sponsor)
+[Chinese Guide](docs/README.zh-CN.md) · [Quick Start](#quick-start) · [Common Workflows](#common-workflows) · [Dashboard](#dashboard) · [Safety](#safety) · [Advanced Usage](docs/advanced-usage.md) · [Sponsor](#sponsor)
 
 ![Codex Fast Proxy dashboard](docs/assets/dashboard.png)