feat(identity): add migration script for Ollama/Python config

- Auto-detects Python command, platform, architecture
- Probes Ollama (local vs remote)
- Sets prose_model based on machine (qwen3:8b for GURU-5070, else qwen3:14b)
- Tested on Mikes-MacBook-Air: all fields populated correctly

Ready for coord rollout to all machines.

.claude/scripts/migrate-identity.sh

@@ -0,0 +1,117 @@
+#!/bin/bash
+# migrate-identity.sh - Auto-detect and populate identity.json with Ollama/Python config
+# Run this on each machine to complete the identity.json migration
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+IDENTITY_PATH="$SCRIPT_DIR/../identity.json"
+
+if [ ! -f "$IDENTITY_PATH" ]; then
+    echo "[ERROR] identity.json not found at $IDENTITY_PATH"
+    echo "        Run onboarding first to create it."
+    exit 1
+fi
+
+echo "[INFO] Detecting machine configuration..."
+
+# Detect Python
+PYTHON_CMD=""
+for cmd in py python3 python; do
+    if command -v "$cmd" >/dev/null 2>&1; then
+        if "$cmd" -c "import sys; sys.exit(0)" >/dev/null 2>&1; then
+            PYTHON_CMD="$cmd"
+            break
+        fi
+    fi
+done
+[ -z "$PYTHON_CMD" ] && PYTHON_CMD="python3"
+echo "  Python: $PYTHON_CMD"
+
+# Detect platform
+PLATFORM=""
+case "$(uname -s)" in
+    Darwin) PLATFORM="macos" ;;
+    Linux) PLATFORM="linux" ;;
+    CYGWIN*|MINGW*|MSYS*) PLATFORM="windows" ;;
+    *) PLATFORM="unknown" ;;
+esac
+echo "  Platform: $PLATFORM"
+
+# Detect architecture
+ARCH=""
+case "$(uname -m)" in
+    x86_64|amd64) ARCH="amd64" ;;
+    arm64|aarch64) ARCH="arm64" ;;
+    *) ARCH="unknown" ;;
+esac
+echo "  Architecture: $ARCH"
+
+# Detect Ollama endpoint
+OLLAMA_ENDPOINT=""
+OLLAMA_FALLBACK="http://100.101.122.4:11434"  # Beast via Tailscale
+PROSE_MODEL="qwen3:14b"  # default
+
+if curl -s -m 2 http://localhost:11434/api/tags >/dev/null 2>&1; then
+    OLLAMA_ENDPOINT="http://localhost:11434"
+    echo "  Ollama: local (localhost:11434)"
+
+    # Check if this is GURU-5070 with 12GB VRAM - use qwen3:8b
+    HOSTNAME=$(hostname)
+    if [[ "$HOSTNAME" == "GURU-5070" ]] || [[ "$HOSTNAME" == "DESKTOP-0O8A1RL" ]]; then
+        PROSE_MODEL="qwen3:8b"
+        echo "    Prose model: qwen3:8b (12GB VRAM machine)"
+    else
+        echo "    Prose model: qwen3:14b (default)"
+    fi
+else
+    OLLAMA_ENDPOINT="$OLLAMA_FALLBACK"
+    echo "  Ollama: remote (Beast via Tailscale)"
+    echo "    Prose model: qwen3:14b (default)"
+fi
+
+# Build updated identity.json
+echo ""
+echo "[INFO] Updating identity.json..."
+
+# Read existing, add new fields, write back
+python3 -c "
+import json, sys
+with open('$IDENTITY_PATH', 'r') as f:
+    data = json.load(f)
+
+# Add new fields if not present
+if 'python' not in data:
+    data['python'] = {}
+data['python']['command'] = '$PYTHON_CMD'
+
+if 'ollama' not in data:
+    data['ollama'] = {}
+data['ollama']['endpoint'] = '$OLLAMA_ENDPOINT'
+data['ollama']['fallback'] = '$OLLAMA_FALLBACK'
+data['ollama']['prose_model'] = '$PROSE_MODEL'
+
+if 'platform' not in data:
+    data['platform'] = '$PLATFORM'
+if 'architecture' not in data:
+    data['architecture'] = '$ARCH'
+
+data['last_updated'] = '$(date -u +"%Y-%m-%dT%H:%M:%SZ")'
+
+with open('$IDENTITY_PATH', 'w') as f:
+    json.dump(data, f, indent=2)
+    f.write('\n')
+
+print('[OK] identity.json updated')
+"
+
+echo ""
+echo "[SUCCESS] Migration complete. New fields added:"
+echo "  python.command: $PYTHON_CMD"
+echo "  ollama.endpoint: $OLLAMA_ENDPOINT"
+echo "  ollama.fallback: $OLLAMA_FALLBACK"
+echo "  ollama.prose_model: $PROSE_MODEL"
+echo "  platform: $PLATFORM"
+echo "  architecture: $ARCH"
+echo ""
+echo "Review: cat $IDENTITY_PATH"