Update README to define zlh-grind as GPT execution workspace

README.md

@@ -1,3 +1,29 @@
 # zlh-grind
 
-The daily GPT grind
+**GPT Execution Workspace for ZeroLagHub**
+
+This repository is dedicated exclusively to **GPT-driven implementation work**.
+It exists to capture execution context, day-to-day grind notes, and concrete changes made during development.
+
+## What This Repo Is For
+- Daily GPT work logs
+- Session handovers
+- Implementation notes and scratchpads
+- Tracking *what was changed, when, and why*
+
+## What This Repo Is NOT
+- ❌ Architecture decisions
+- ❌ Cross-project source of truth
+- ❌ Product or strategy documentation
+
+All canonical architecture, decisions, and references live in:
+**`jester/knowledge-base`**
+
+## Working Rules
+- This repo may be messy, iterative, and practical
+- Prefer clarity over polish
+- Reference canonical docs instead of duplicating them
+
+---
+
+If it happened during hands-on GPT execution, it belongs here.