OpenClaw 2026.6.34: extended-stable security release, Plugin SDK removals announced

Maintenance release on the extended-stable line — targeted security and reliability repairs, no new features. Notable for plugin authors: `before_agent_start`, root `openclaw/plugin-sdk` imports, `providerAuthEnvVars`, and `channelEnvVars` are scheduled for removal. OpenCode Go users get the corrected `hy3` model identifier in place of the failing `hy3-preview` alias.

Tool: openclaw · Version: v2026.6.34 · Significance: 3/5 · security, fix, deprecation, model-support