[codex] Fix OpenClaw 2026.5.7 plugin compatibility

[Prasanna721]

Summary

• add compiled runtime packaging via openclaw.runtimeExtensions and prepack build
• declare Supermemory tool ownership in openclaw.plugin.json contracts
• collapse duplicate Supermemory CLI registration into one descriptor-backed registrar
• enable conversation hook access during setup so agent_end auto-capture works
• bump plugin release to 2.1.12 and require OpenClaw >=2026.5.7

Root Cause

OpenClaw 2026.5.7 enforces newer plugin contracts: installed packages need compiled JS runtime output, agent tools must be declared in contracts.tools, duplicate CLI command roots are rejected, and non-bundled agent_end hooks require explicit hooks.allowConversationAccess=true.

Validation

• npm run build
• npm run check-types
• npm run lint
• npm pack --dry-run --json
• openclaw plugins inspect openclaw-supermemory --runtime --json -> diagnostics: []
• openclaw plugins doctor -> no plugin issues
• local linked Gateway loaded plugin 2.1.12 from dist/index.js
• chat smoke captured marker openclaw-supermemory-userkey-smoke-20260507-a and openclaw supermemory search found it in Supermemory

Notes

The remaining local warning is unrelated: memory-lancedb is configured but not installed in this OpenClaw profile.

[linear]

ENG-700