feat: Enhance updater and wizard with mode switch and verification

[gray584321]

Summary

Enhancements to make the updater and wizard more robust and user-friendly.

Changes

opc/scripts/setup/update.py

• Added --mode copy|symlink to switch between installation modes
• Added --verify to check installation integrity
• Added verification logic that checks all components (hooks, skills, rules, agents, servers, runtime, plugins, scripts, settings.json)

opc/scripts/setup/wizard.py

• Added --yes/-y alias for --force (non-interactive mode)
• Added --mode copy|symlink for mode switching
• Added --verify for installation verification
• Updated help examples with new options

New Commands

# Switch to symlink mode
uv run python -m scripts.setup.wizard --mode symlink

# Verify installation
uv run python -m scripts.setup.wizard --verify

# Preview what update would do
uv run python -m scripts.setup.update --dry-run

# Switch mode during update
uv run python -m scripts.setup.update --mode copy

# Verify after update
uv run python -m scripts.setup.update --verify

# Non-interactive install
uv run python -m scripts.setup.wizard --yes

Test Plan

• Mode switching works for both copy and symlink
• Verification reports all components correctly
• Non-interactive mode uses defaults
• Help text shows new options