feat: add three-tier shell execution with kubectl support
Introduce shell classifier, executor, kubeconfig manager, and kubectl
binary management. Integrates with existing commands/agentic.rs primitives.
- Add shell/classifier.rs: Three-tier safety classification (Tier 1: auto-execute, Tier 2: approve, Tier 3: deny)
- Add shell/executor.rs: Command executor with approval gates
- Add shell/kubeconfig.rs: kubeconfig parsing and management
- Add shell/kubectl.rs: kubectl binary management
- Add commands/shell.rs: Tauri IPC commands for shell execution
- Update state.rs: Add pending_approvals field for approval flow
- Update lib.rs: Register shell module and commands
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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