fix: enable CD behavior for all shortcut styles

[avihut]

Summary

• Add shell wrapper functions for all shortcuts (git, shell, legacy styles) to daft shell-init output
• Automatically install git-style shortcuts during daft setup
• Show hint about switching to other shortcut styles

Problem

When using shortcut symlinks (gwtco, gwtcb, etc.), the CD behavior didn't work because symlinks bypass the shell wrapper functions that handle the __DAFT_CD__ marker.

Solution

1. Shell wrappers for all shortcuts: Shell functions take precedence over symlinks. By defining wrapper functions for all shortcuts in daft shell-init, CD behavior now works regardless of how commands are invoked.

2. Auto-install shortcuts: daft setup now automatically installs git-style shortcuts, so users get a complete setup in one command.

3. Hint about alternatives: After setup, users see how to switch to other shortcut styles if they prefer.

What users see after daft setup

Done! Shell integration added to /Users/user/.zshrc
      Git-style shortcuts installed (gwtco, gwtcb, etc.)

To activate, either:
  1. Restart your terminal, or
  2. Run: source /Users/user/.zshrc

To use different shortcut styles:
  daft setup shortcuts only shell   # gwco, gwcob, gwcobd
  daft setup shortcuts only legacy  # gclone, gcw, gcbw, ...

Test plan

• cargo clippy -- -D warnings passes
• cargo fmt -- --check passes
• just test-unit passes (97 tests)
• Manual test: run daft setup, verify shortcuts installed and CD works

Related

• Fixes fix: enable CD behavior for all shortcut styles #79
• Homebrew caveats PR: docs: update caveats for auto-install shortcuts homebrew-daft#2

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