fix: add missing contracts.tools declaration for OpenClaw tool allowlist

[saraphine001]

Summary

Without contracts.tools in openclaw.plugin.json, OpenClaw's tool allowlist filtering blocks all 14 plugin tools at runtime:

plugin must declare contracts.tools for: memory_search, memory_get, memory_timeline...

Fix

Add the contracts.tools array containing all 14 tools implemented by the plugin:

"contracts": {
  "tools": [
    "memory_search", "memory_get", "memory_timeline", "memory_viewer",
    "task_summary", "skill_search", "skill_install", "skill_upgrade",
    "memory_share", "memory_unshare", "skill_publish", "skill_unpublish",
    "network_skill_pull", "network_team_info"
  ]
}

Impact

All tools become callable after gateway restart with no other configuration changes needed.

Fixes #1639.