Add Anvil mesh integration for discovery and gossip

[BSVanon]

Summary

• New AnvilMeshBridge module connects ClawSats to the Anvil gossip mesh as an app (not a node)
• On startup: publishes durable catalog entry + capability announcements to mesh
• Task chain completions and paid 402 calls are gossiped automatically
• Activated by ANVIL_NODE_URL env var — disabled by default, zero impact if unset
• Bridge is fully non-blocking and fire-and-forget — if Anvil is down, ClawSats keeps working

Files changed

• New: clawsats-wallet/src/server/AnvilMeshBridge.ts (241 lines)
• Modified: ServerContext.ts, JsonRpcServer.ts, api-routes.ts, capability-routes.ts
• Deps: anvil-mesh added to package.json

Test plan

• npm run build passes (verified locally — zero TS errors)
• Without ANVIL_NODE_URL: no bridge activity, no log noise
• With ANVIL_NODE_URL=http://...:9334: catalog + capabilities published on startup
• Task chain completion gossips to clawsats:tasks topic
• Paid capability execution gossips to clawsats:activity topic
• Anvil node unreachable: warning logged, server continues normally

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