chore: decommission repository and document migration to new runtime structure

DECOMMISSIONED.md

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+# Decommissioned Workspace
+
+This repository is no longer the active AIWorkspace runtime.
+
+As of 2026-05-22, the active split is:
+
+- reusable core: `/Users/david/Developer/ai-workspace`
+- Fidelity context pack: `/Users/david/Developer/fidelity-ai-context`
+- local project registry: `~/Library/Application Support/AIWorkspace/projects.json`
+- runtime state: `~/Library/Application Support/AIWorkspace/runtime/`
+- logs: `~/Library/Logs/AIWorkspace/`
+
+Do not start services from this repository unless intentionally rolling back.
+
+Use the new core instead:
+
+```bash
+cd /Users/david/Developer/ai-workspace
+python3 scripts/aiw/services.py status --project fidelity
+python3 scripts/aiw/services.py doctor --project fidelity
+```
+
+The old profile-based service manager may report services as `externally running`
+because the new core owns the same health ports.