chore: Remove deprecated frontmatter reference; add master README template

templates/readme-master.md

@@ -0,0 +1,45 @@
+# {{MASTER_REPO}}
+
+Master (umbrella) repository for the Knowledge Genome network.
+
+| Field      | Value                                              |
+| ---------- | -------------------------------------------------- |
+| Owner      | `{{FORGEJO_USER}}`                                 |
+| Remote     | `{{FORGEJO_URL}}/{{FORGEJO_USER}}/{{MASTER_REPO}}` |
+| Scaffolded | `{{DATE}}`                                         |
+
+## What this repo is
+
+This repository does **not** hold knowledge itself. It is the orchestrator: each genome
+is a Git submodule, plus `core-karpathy` as a read-only reference pattern. Cross-genome
+coordination rules live in `AGENTS.md`.
+
+```text
+{{MASTER_REPO}}/
+├── core-karpathy/   ← reference pattern — read-only, never modify
+├── genome-*/        ← one submodule per genome (own AGENTS.md, own git-crypt)
+└── AGENTS.md        ← cross-genome coordinator (boundaries only)
+```
+
+## Working with submodules
+
+```bash
+# Clone with all genomes
+git clone --recurse-submodules {{FORGEJO_URL}}/{{FORGEJO_USER}}/{{MASTER_REPO}}.git
+
+# Pull the latest pointers for every genome
+git submodule update --remote --merge
+
+# Operate inside a single genome (one genome at a time — see AGENTS.md)
+cd genome-<name>
+```
+
+## Rules of the road
+
+- Operate within **one genome at a time**; no commits spanning multiple genomes.
+- `core-karpathy` is read-only.
+- Never commit to `main` in a genome — PRs only, no self-merge.
+- Private data (`**/private/**`) is git-crypt encrypted and never leaves the local network.
+
+Genome-level operations are governed by each genome's own `AGENTS.md`. This README and the
+master `AGENTS.md` govern boundaries only.