[Link Agent Wallet] Add report command for agent observability

[drapeau-stripe]

Summary

Adds link-cli report command for reporting purchase outcomes. Agents call this after every purchase attempt to record what happened (success, blocked, abandoned) along with structured tags and context.

link-cli report \                                                                                                                                                                                                                        
  --domain merchant.com \                                       
  --outcome blocked \                                                                                                                                                                                                                    
  --spend-request-id lsrq_abc123 \
  --tag captcha \                                                                                                                                                                                                                        
  --step "checkout payment form" \                              
  --freeform-context "Challenge appeared after clicking Place Order"                                                                                                                                                                     

Changes:

• packages/cli/src/commands/report/index.tsx — Command definition using incur + zod
• packages/cli/src/utils/resource-factory.ts — Add createReportResource()
• packages/cli/src/cli.tsx — Register the command

The command uses outputPolicy: 'agent-only' and is automatically exposed as an MCP tool when running with --mcp.

Stack

#	PR	What it does
1	#114	SDK resource
2	(this PR)	CLI report command
3	#116	Skill instructions