Compaction tip references non-existent plugin marketplace and plugin

Description

During conversation compaction, an automated tip appears suggesting to install a plugin that doesn't exist:

Tip: Working with HTML/CSS? Add the frontend-design plugin:
    /plugin marketplace add anthropics/claude-code
    /plugin install frontend-design@claude-code-plugins

Steps to Reproduce

1. Have a conversation that triggers compaction
2. Observe the tip that appears

Actual Behavior

When following the suggested commands:

1. /plugin marketplace add anthropics/claude-code fails with:

``
Error: Failed to clone marketplace repository: Cloning into '/Users/.../.claude/plugins/marketplaces/anthropic-claude-code'...
remote: Repository not found.
fatal: repository 'https://github.com/anthropic/claude-code.git/' not found
``

1. /plugin install frontend-design@claude-code-plugins fails with:

``
Plugin "frontend-design" not found in any marketplace
``

Expected Behavior

Tips should only reference plugins and marketplaces that actually exist and are publicly available.

Environment

• Claude Code v2.0.57
• macOS (Darwin 25.1.0)

Screenshots

The tip appears in the compaction message like this:

· Compacting conversation… (esc to interrupt)
  └ Tip: Working with HTML/CSS? Add the frontend-design plugin:
        /plugin marketplace add anthropics/claude-code
        /plugin install frontend-design@claude-code-plugins