Summary

Add e2e tests to protect against runtime module resolution errors like the one reported in #6291.

Background

Reference issue: #6291

The error occurred when the minimax-portal-auth plugin failed to load because the clawdbot/plugin-sdk module could not be found at runtime:

Error: Cannot find module 'clawdbot/plugin-sdk'
Require stack:
- /root/.nvm/versions/node/v24.13.0/lib/node_modules/openclaw/extensions/minimax-portal-auth/index.ts

This type of error suggests that:

1. The plugin's dependencies aren't being bundled correctly
2. The module resolution is failing at runtime despite working during build
3. There's no test that validates plugin loading works end-to-end

Task

Add e2e tests that:

1. Load and verify all bundled plugins/extensions can be required without errors
2. Test that plugin dependencies are resolved correctly after packaging/bundling
3. Validate the packaged output works in a clean environment (simulating npm install behavior)

Acceptance Criteria

• E2e test suite exists that validates plugin loading
• Test runs in CI/CD pipeline
• Test catches missing peer dependencies or incorrect bundling
• Documentation on how to run the e2e tests locally