feat: add health check endpoint /healthz

[Tonyfudecai]

Description

Implement a simple HTTP health check endpoint at /healthz that returns node status.

Requirements

• GET /healthz returns 200 OK with JSON: {status: 'ok', uptime: ..., version: ...}
• Include Go version, build time, agent name
• Add tests

Skills

Go, net/http

[mingisrookie]

I’m working on this now. Plan: add focused tests for GET /healthz, include status/uptime/version/go_version/build_time/agent_name/node_id in the JSON response, keep the existing edge server API intact, and run go test ./pkg/edge plus full repo validation. I also noticed the current baseline go test ./... has an unrelated failing gene selector test; I’ll either isolate that in the report or include the smallest fix if needed so CI is green.

[mingisrookie]

Opened PR #14: https://github.com/Clawland-AI/picclaw/pull/14\n\nIt covers the /healthz requirements (status, uptime, version, Go version, build time, agent name) with tests. I also fixed the pre-existing gene selector test failure so full validation passes: go test ./..., go vet ./..., and go build ./....