Refactor clipboard tools into unified clip dispatcher

[Jython1415]

Summary

This PR refactors the clipboard tooling in the dotfiles repository into a cleaner, more maintainable architecture with a unified clip dispatcher and better separation of concerns.

Key Changes

New Architecture:

• ✅ Created lib/ directory for internal utilities (not in PATH)
• ✅ New clip dispatcher script with unified interface for all clipboard operations
• ✅ Renamed tagwrap → wrap (general-purpose, works standalone or via clip)
• ✅ Moved html-clipboard to lib/ (internal helper)
• ✅ Deleted markdownify-clipboard and normalize-clipboard (replaced by clip subcommands)
• ✅ Updated .zshrc to remove obsolete functions (copyxlsx, copycsv, cliptagwrap)

New clip Dispatcher Subcommands:

clip get/set/copy/paste      # Basic clipboard operations
clip markdownify             # HTML → Markdown (macOS only)
clip normalize               # HTML cleanup (macOS only)
clip import csv/xlsx         # Import data files to clipboard
clip wrap TAG [args]         # Wrap clipboard in XML tags
clip merge [args]            # Merge Alfred clipboard history

Platform Support:

• macOS: Full support (pbcopy/pbpaste + HTML operations)
• Linux (Wayland): wl-copy/wl-paste (HTML support deferred)
• Linux (X11): xclip (HTML support deferred)

Benefits:

• Unified interface via clip command
• Clear separation: bin/ in PATH, lib/ for internals
• Per-subcommand dependency checking with helpful errors
• General-purpose tools (wrap, csvcat, xlcat) remain usable independently
• Better error messages and platform detection

Repository Structure

~/.dotfiles/
├── bin/                    # In PATH via .zshrc
│   ├── clip               # New dispatcher (routes to subcommands)
│   ├── wrap               # Renamed from tagwrap (general-purpose)
│   ├── clipmerge          # Keep as-is
│   ├── csvcat             # Keep as-is
│   ├── xlcat              # Keep as-is
│   └── ...
├── lib/                   # Internal utilities (NOT in PATH)
│   └── html-clipboard     # Moved from bin/
└── .zshrc                 # Cleaned up (removed obsolete functions)

Migration Guide

Old → New:

# Clipboard operations
copyxlsx              → clip import xlsx
copycsv               → clip import csv
cliptagwrap TAG       → clip wrap TAG
markdownify-clipboard → clip markdownify
normalize-clipboard   → clip normalize

# Standalone tools still work
tagwrap TAG           → wrap TAG

Testing

• ✅ Tested clip help (works without clipboard utilities)
• ✅ Tested wrap standalone functionality
• ✅ Tested wrap with attributes
• ✅ Verified file structure (lib/, bin/)
• ✅ Verified git changes (renames, deletions, new files)

Files Changed

• bin/clip - New unified dispatcher
• bin/wrap - Renamed from tagwrap, updated docs
• lib/html-clipboard - Moved from bin/
• .zshrc - Removed obsolete functions
• Deleted: bin/markdownify-clipboard, bin/normalize-clipboard

Resolves #5

[Jython1415]

Looks good!