feat: TownOps triage scenario with multi-agent coordination

Description

The pitch.

## Town Operations Triage Plugin

Adds a complete town operations triage scenario for the NANDA Town hackathon.

### Files Added
- \`scenarios/town_ops.yaml\` — Multi-agent town operations triage scenario with 6 specialized agents (triage, dispatcher, resident, resolver, coordinator)
- \`templates/agents/townops-triage-agent.yaml\` — Triage agent template for classifying citizen-reported issues
- \`templates/agents/townops-resident-agent.yaml\` — Resident-facing agent for plain-language status updates
- \`docs/townops-plugin.md\` — Comprehensive documentation with architecture, API integration, and testing guide

### Integration
- Works with [TownOps Skill](https://github.com/Rohan5commit/townops-skill) — a deployed agent-usable town operations triage API
- Live demo: https://townops-skill.vercel.app
- API Inspector: https://townops-skill.vercel.app/api-inspector
- SKILL.md: https://townops-skill.vercel.app/skill-viewer

### Scenario Details
- **Tier 2** (LLM-powered agents)
- **6 agents**: triage-agent, 2x zone-dispatcher, resident-agent, resolver-agent, coordinator
- **8 issue types**: Pothole, Streetlight Outage, Tree Hazard, Water Leak, Noise Complaint, Road Closure, Garbage Collection, Graffiti
- **5 zones**: Downtown, Residential North/South, Commercial East, Industrial West
- **SLA tracking**: Critical (2h), High (12h), Medium (48h), Low (168h)
- **5% message drop** for resilience testing

### Judging Dimensions
- **Correctness**: Pipeline triages → dispatches → resolves → notifies citizens
- **Test Rigor**: Deterministic seed, SLA compliance metrics, trace output
- **API Fit**: Uses standard NANDA layers (transport, comms, identity, registry, auth, trust, payments, coordination, negotiation, memory, privacy, datafacts)
- **Docs**: Full architecture docs, API reference, integration guide
- **Novelty**: Real-world municipal operations use case with severity-based SLA escalation
- **Persona Fidelity**: Each agent has clear role boundaries and communication protocols