Filter baseline variables from session persistence

[twokidsCarl]

Summary

• Root cause found: RubyGems ruby_executable_hooks wrapper creates title, content, index, skipped_content, start_line in TOPLEVEL_BINDING. These were saved to values.json on exit and restored on next launch.
• Fix: Pass baseline_vars to Serializer.save — only user-defined session variables are persisted, pre-existing binding variables are excluded.
• Cleanup: Removed dirty entries from test/.ruby-claw/values.json

Test plan

• 98 TUI tests pass
• Manual: launch claw from test/ dir, verify no stale variables in Binding panel

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: e963dbd5-ad53-460b-8302-dbb9c7995692

📥 Commits

Reviewing files that changed from the base of the PR and between 2ca4471 and 605a596.

📒 Files selected for processing (3)

• lib/claw/serializer.rb
• lib/claw/tui/model.rb
• lib/claw/version.rb

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/serializer-filter-vars

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