feat: add VS Code extension with inline security warnings

[idiottrader]

Summary

This PR adds a VS Code extension for ISNAD as requested in #6.

Features

• ✅ Inline security warnings for dependencies
• ✅ Hover tooltips with trust details
• ✅ Auto-scan on file open/save
• ✅ Configurable sensitivity levels
• ✅ SARIF/JSON output support
• ✅ Status bar integration
• ✅ Attestation dashboard

Commands

• ISNAD: Scan Current File - Manual file scan
• ISNAD: Scan Workspace - Bulk workspace scan
• ISNAD: Check Attestation Status - View attestation details

Configuration

• isnad.sensitivity: low/medium/high
• isnad.autoScan: Enable auto-scan
• isnad.showInlineWarnings: Show/hide warnings

Trust Tiers Display

• 🟢 VERIFIED (>80%)
• 🟡 COMMUNITY (50-80%)
• 🔴 UNVERIFIED (<50%)

Closes #6

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