prompts: add prompt quality guide

Author: OgeonX-Ai

docs/prompts/quality.md

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+# Prompt Quality
+
+Prompt quality in AI-OS is measured by whether the prompt produces safe, verifiable engineering behavior.
+
+## Quality loop
+
+```mermaid
+flowchart TD
+    A[Prompt] --> B[Run task]
+    B --> C[Collect output]
+    C --> D[Check evidence]
+    D --> E{Good?}
+    E -- No --> F[Improve prompt]
+    F --> B
+    E -- Yes --> G[Keep]
+```
+
+## Quality criteria
+
+- goal is clear
+- loop is selected
+- plan appears before work
+- verifier evidence is included
+- risks are explicit
+- docs are updated when needed
+- remaining work is stated