refactor(skill): replace claude-specific dirs with agentskills.io standard

Replace AGENTS.md / claude-skill/ with a proper agentskills.io-compliant
skill directory. Any AI agent that supports the open Agent Skills standard
(Claude Code, OpenCode, Cursor, Codex, etc.) can now install and use this
skill generically.

Changes:
- Remove AGENTS.md (was Claude-specific convention)
- Remove claude-skill/ directory (was Claude-specific naming)
- Add timesfm-forecasting/SKILL.md with compliant frontmatter:
    name: timesfm-forecasting
    description: ...
    license: Apache-2.0
    metadata: author, version
- Rename claude-skill/examples/ → timesfm-forecasting/examples/
- Rename claude-skill/scripts/  → timesfm-forecasting/scripts/
- Rename claude-skill/references/ → timesfm-forecasting/references/
- Update .gitattributes paths to match new directory

Skill installs via:
  cp -r timesfm-forecasting/ ~/.claude/skills/
  cp -r timesfm-forecasting/ ~/.cursor/skills/
  # or any agent that supports agentskills.io

Spec: https://agentskills.io/specification

timesfm-forecasting/examples/global-temperature/run_example.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+# run_example.sh - Run the TimesFM temperature anomaly forecasting example
+#
+# This script:
+# 1. Runs the preflight system check
+# 2. Runs the TimesFM forecast
+# 3. Generates the visualization
+#
+# Usage:
+#   ./run_example.sh
+#
+# Prerequisites:
+#   - Python 3.10+
+#   - timesfm[torch] installed: uv pip install "timesfm[torch]"
+#   - matplotlib, pandas, numpy
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SKILL_ROOT="$(dirname "$(dirname "$SCRIPT_DIR")")"
+
+echo "============================================================"
+echo "  TimesFM Example: Global Temperature Anomaly Forecast"
+echo "============================================================"
+
+# Step 1: Preflight check
+echo ""
+echo "🔍 Step 1: Running preflight system check..."
+python3 "$SKILL_ROOT/scripts/check_system.py" || {
+    echo "❌ Preflight check failed. Please fix the issues above before continuing."
+    exit 1
+}
+
+# Step 2: Run forecast
+echo ""
+echo "📊 Step 2: Running TimesFM forecast..."
+cd "$SCRIPT_DIR"
+python3 run_forecast.py
+
+# Step 3: Generate visualization
+echo ""
+echo "📈 Step 3: Generating visualization..."
+python3 visualize_forecast.py
+
+echo ""
+echo "============================================================"
+echo "  ✅ Example complete!"
+echo "============================================================"
+echo ""
+echo "Output files:"
+echo "  - $SCRIPT_DIR/output/forecast_output.csv"
+echo "  - $SCRIPT_DIR/output/forecast_output.json"
+echo "  - $SCRIPT_DIR/output/forecast_visualization.png"