chore: add Cortex child governance

AGENTS.md

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+# Svrnty Vision Child Workspace Rules
+
+This workspace is child-local under the Cortex OS umbrella.
+
+It is not Cortex OS Core authority. Promotion into Core requires a governed Core route.
+
+## Authority Order
+
+1. `/home/svrnty/workspaces/cortex-os/core` active SOT.
+2. `/home/svrnty/workspaces/cortex-os/core/AGENTS.md`.
+3. This file.
+4. `README.md`, `WORKBOARD.yaml`, and local tools.
+
+## Editing Rule
+
+Keep work inside this workspace unless Core explicitly routes promotion.
+
+After editing, run:
+
+```bash
+python3 tools/validate_svrnty_vision_child.py
+```
+
+## Protected Boundaries
+
+- Do not mutate `../core/` from this workspace.
+- Do not mutate sibling repositories.
+- Do not import this workspace into Core source.

WORKBOARD.yaml

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+items:
+  - id: SVRNTY-VISION-WORK-001
+    title: Svrnty Vision Child Workspace Governance
+    status: candidate
+    source: README.md
+    owner: jp

tools/validate_svrnty_vision_child.py

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+#!/usr/bin/env python3
+"""Validate Svrnty Vision child workspace governance shell."""
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+REQUIRED = ["AGENTS.md", "README.md", "WORKBOARD.yaml"]
+
+
+def main() -> int:
+    errors: list[str] = []
+    for rel in REQUIRED:
+        if not (ROOT / rel).exists():
+            errors.append(f"missing:{rel}")
+    checks = {
+        "AGENTS.md": ["child-local", "not Cortex OS Core authority", "python3 tools/validate_svrnty_vision_child.py"],
+        "WORKBOARD.yaml": ["SVRNTY-VISION-WORK-001", "status: candidate", "owner: jp"],
+    }
+    for rel, snippets in checks.items():
+        path = ROOT / rel
+        if path.exists():
+            text = path.read_text(encoding="utf-8")
+            for snippet in snippets:
+                if snippet not in text:
+                    errors.append(f"{rel}:missing:{snippet}")
+    result = {"ok": not errors, "validator": "svrnty-vision-child-v1", "checked": REQUIRED, "errors": errors, "warnings": []}
+    print(json.dumps(result, indent=2, sort_keys=True))
+    return 0 if result["ok"] else 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())