Plugin cache missing dependencies on first run

[avifenesh]

Problem

When the plugin is freshly cached (e.g., after install or cache refresh), npm install and npx playwright install chromium have not been run. Running any web-ctl command fails with:

{ "error": "action_error", "message": "Cannot find module 'playwright'" }

The user must manually run npm install and npx playwright install chromium in the plugin cache directory before the plugin works.

Expected Behavior

The plugin should either:

1. Run dependency installation as a post-install hook when cached
2. Detect missing dependencies on first run and install them automatically
3. Document the setup step clearly in an error message with the exact commands needed

Reproduction

1. Fresh plugin cache at ~/.claude/plugins/cache/agentsys/web-ctl/1.0.0/
2. Run any web-ctl command
3. Fails with "Cannot find module 'playwright'"

Impact

Blocks all web-ctl usage until manually resolved. No guidance in the error message on how to fix it.

[avifenesh]

[DONE] Task Completed Successfully

PR: #72
Status: Merged to main
Commit: 0d3a728

Summary

• Auto-install playwright and Chromium on first browser operation
• Lockfile-based coordination prevents race conditions
• missing_dependency error classification as fallback
• WEB_CTL_SKIP_AUTO_INSTALL=1 env var for CI/sandboxed environments
• 22 new tests, 2 pre-existing platform test failures fixed

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