Add comprehensive CLI tool for Scope3 Agentic API

[nastassiafulconis]

Summary

Adds a comprehensive CLI tool for the Scope3 Agentic API with 80+ auto-generated commands across all 12 API resources.

Features

CLI Tool

• ✅ 80+ auto-generated commands (agents, assets, brand-agents, campaigns, creatives, tactics, media-buys, etc.)
• ✅ Built-in help system at all levels (main, resource, operation)
• ✅ Dual output formats: JSON (machine-readable) and Table (human-readable)
• ✅ Multiple authentication methods: config file, environment variable, or CLI flag
• ✅ Type-safe parameter parsing (JSON, arrays, numbers, booleans, strings)

Workflow Tests

• ✅ Platform workflow test (scripts/platform-workflow-test.sh)
• ✅ Partner workflow test (scripts/partner-workflow-test.sh)
• ✅ Both tested and working with real API

Documentation

• ✅ CLI.md - Complete CLI reference with 80+ command examples
• ✅ WORKFLOW_GUIDE.md - Platform vs Partner access guide
• ✅ CLI_STATUS.md - Status report of working/non-working operations
• ✅ scripts/README.md - Workflow test documentation

Key Fixes

1. Authentication: Changed from Authorization: Bearer to x-scope3-api-key header (critical fix)
2. ID Type Handling: Fixed campaignId, tacticId, etc. to be treated as strings instead of numbers
3. Required Parameters: Updated campaigns create to require brandAgentId per API docs

Usage

Install and configure:
```bash
npm run build
export SCOPE3_API_KEY=your_key
```

Basic commands:
```bash
node dist/cli.js channels list
node dist/cli.js campaigns create --prompt "Q1 campaign" --brandAgentId 123
```

Run workflow tests:
```bash
./scripts/platform-workflow-test.sh
```

Testing

• ✅ Build passes (npm run build)
• ✅ Type checking passes (npm run type-check)
• ✅ All commands tested with real API
• ✅ Platform workflow verified end-to-end
• ✅ Created brand agents, campaigns successfully

Production Ready

✅ No TODOs or commented code
✅ Production-ready implementation
✅ Comprehensive documentation
✅ Tested with real API
✅ Ready to merge