Bug Description

Plugin hooks (before_prompt_build, agent_end) registered by a custom plugin are not firing for the Feishu channel's main agent (embedded PI runtime), while the same hooks fire correctly for the heartbeat agent (hermes, harness runtime).

Environment: OpenClaw v2026.5.2 (commit 8b2a6e5), plugin memory-tencentdb v0.2.0
Platform: Feishu channel, main agent (embedded PI runtime selection-D1C7VClx.js)
Working correctly: Heartbeat agent hermes (harness runtime)

Steps to Reproduce

1. Register a plugin with before_prompt_build and agent_end hooks
2. Configure the plugin for the Feishu channel and for the main agent in openclaw.json
3. Set allowPromptInjection: true and allowConversationAccess: true in plugin config
4. Send a message via Feishu → hooks do NOT fire
5. Heartbeat cron runs → agent_end hook does fire

Expected Behavior

Hooks should fire for the Feishu main agent, just as they do for the hermes agent.

Root Cause Analysis

• Plugin registration works: logs show hooks are registered with correct registry
• Hook runner IS initialized for the hermes (harness) agent → hooks fire correctly
• For the main agent (embedded PI runtime selection-D1C7VClx.js), the embedded runtime has an isRawModelRun guard (line 7697) and calls resolvePromptBuildHookResult at lines 8198/8224
• v2026.5.2 commit 8283c5d6 ("perf(plugins): reuse startup runtime registry") changed plugin scoping — likely caused the embedded PI runtime's hook bridging to fail to connect to the plugin registry

Likely related issues:

• [Bug]: Transcript writes lost after tool-call turns (2026.5.2) — replies visible in channel but missing from .jsonl #76568 — Transcript writes lost after tool-call turns (v2026.5.2, embedded runtime, agent_end not firing)
• Queued messages get merged into single reply when session processes them sequentially #76632 — Queued messages get merged into single reply (v2026.5.2, feishu, embedded PI runtime)
• [Bug]: message_sending hook event not firing for user-defined hooks #73542 — message_sending hook not firing (hook bridging missing triggerInternalHook path)

Plugin Config

{
  "allowConversationAccess": true,
  "allowPromptInjection": true
}

Channel and agent both include plugins: - "memory-tencentdb".

Additional Context

• Same plugin with same hooks works on hermes agent (harness runtime) → plugin code is correct
• allowPromptInjection: true does NOT fix the issue
• Problem appears specific to the embedded PI runtime (selection-D1C7VClx.js) used by the main agent on Feishu