[codex] Build coding-deepgent local parity baselines

.agents/skills/before-backend-dev/SKILL.md

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+---
+name: before-backend-dev
+description: "Read the backend development guidelines before starting your development task."
+---
+
+Read the backend development guidelines before starting your development task.
+
+Execute these steps:
+1. Read `.trellis/spec/backend/index.md` to understand available guidelines
+2. Based on your task, read the relevant guideline files:
+   - Database work → `.trellis/spec/backend/database-guidelines.md`
+   - Error handling → `.trellis/spec/backend/error-handling.md`
+   - Logging → `.trellis/spec/backend/logging-guidelines.md`
+   - Type questions → `.trellis/spec/backend/type-safety.md`
+3. Understand the coding standards and patterns you need to follow
+4. Then proceed with your development plan
+
+This step is **mandatory** before writing any backend code.

.agents/skills/before-frontend-dev/SKILL.md

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+---
+name: before-frontend-dev
+description: "Read the frontend development guidelines before starting your development task."
+---
+
+Read the frontend development guidelines before starting your development task.
+
+Execute these steps:
+1. Read `.trellis/spec/frontend/index.md` to understand available guidelines
+2. Based on your task, read the relevant guideline files:
+   - Component work → `.trellis/spec/frontend/component-guidelines.md`
+   - Hook work → `.trellis/spec/frontend/hook-guidelines.md`
+   - State management → `.trellis/spec/frontend/state-management.md`
+   - Type questions → `.trellis/spec/frontend/type-safety.md`
+3. Understand the coding standards and patterns you need to follow
+4. Then proceed with your development plan
+
+This step is **mandatory** before writing any frontend code.