Cannot uninstall plugin: enabledPlugins false ignored, plugin re-installs every session

Bug Description

Unable to permanently uninstall or disable the Playwright plugin (playwright@claude-plugins-official). The plugin keeps getting re-installed on every new session despite multiple removal attempts.

Steps to Reproduce

1. Install the playwright plugin from the claude-plugins-official marketplace
2. Attempt to disable/uninstall it using any of these methods:

• Set "playwright@claude-plugins-official": false in enabledPlugins in ~/.claude/settings.json
• Remove the entry from ~/.claude/plugins/installed_plugins.json
• Delete the plugin cache directory (~/.claude/plugins/cache/claude-plugins-official/playwright/)
• Delete the marketplace directory (~/.claude/plugins/marketplaces/claude-plugins-official/external_plugins/playwright/)

1. Open a new Claude Code session in any project

Expected Behavior

• Setting enabledPlugins to false should prevent the plugin from loading
• Removing from installed_plugins.json should keep it uninstalled
• The /plugin UI should allow uninstalling via space bar or an uninstall option

Actual Behavior

• The plugin re-appears in installed_plugins.json with a new gitCommitSha on every session start (observed it reinstall itself twice within the same day with different commit SHAs)
• enabledPlugins: false in settings.json does not prevent the MCP server from loading
• In the /plugin UI, the plugin shows as ✔ playwright [testing] (installed) with the cursor on it, but:
• Space bar does nothing (UI says "Space to toggle")
• Enter navigates to details instead of toggling

Additional Context

• The only thing that partially works is per-project disabledMcpServers: ["playwright"] in ~/.claude.json, but this only applies to projects where it's already been disabled — new projects still get the MCP
• Claude Code version: 2.1.56
• OS: macOS (Darwin 25.3.0, Apple Silicon)