refactor: remove dead code, unused scripts and v1-only tests

[arzafran]

What this does

Deletes code, scripts and tests that nothing runs. The one user-visible change is that the old programa codex install-hooks and uninstall-hooks aliases are gone; install-integration and uninstall-integration do the same thing and are what the docs already point to.

What goes

• The CLI's fallback for servers without system.tree. The app and CLI ship together, so it never ran.
• Unused functions: TabManager.closeSurface, NotificationSoundSettings.isSilent, the app-icon observer's stopObserving, the debug flash helpers in Panel.swift, MCP stringArray.
• The draw-stats chain, which always reported zero. The debug render_stats payload loses drawCount and lastDrawTime.
• Test-only helpers in TerminalController.swift and their tests.
• Two Rust FFI exports the Windows app never calls (scroll_to_bottom, selection_clear) and their header and ABI doc entries.
• scripts/launch-tagged-automation.sh, scripts/icon-gen/, tests_v2/test_v1_panel_creation_preserves_focus.py (v1 commands only, never in CI) and tests_v2/test_visual_screenshots.py (manual screenshot tool).

Review order

1. CLI/CLI+Tree.swift (biggest Swift cut)
2. CLI/HookInstallationCoordinator.swift plus tests/test_cli_codex_hook_trust.py (alias removal; the test now uses the current names)
3. Everything else is straight deletion.

Test plan

• CI passes, including test_cli_codex_hook_trust.py
• programa codex install-integration still installs the hooks