Clean up stale command references in docs

[twokidsCarl]

Summary

• Remove /shell, /memory, /forget from tab completion candidates (non-existent in TUI)
• Remove duplicate /role from completions (already in Commands::COMMANDS)
• Update ObjectExplorer docstring to remove /ls and /whereami (removed in round 2)

Test plan

• 85 TUI tests pass
• Tab completion still works for all valid commands

🤖 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: 7417d1c8-80ef-4761-bea1-f6e9e48a64e0

📥 Commits

Reviewing files that changed from the base of the PR and between aee353e and 441c21f.

📒 Files selected for processing (3)

• lib/claw/tui/input_handler.rb
• lib/claw/tui/object_explorer.rb
• lib/claw/version.rb

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/docs-cleanup

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