refactor: Replace doom-modeline with mood-line and remove deprecated tree-sitterHEADmain

Method 2 improvements for cleaner, faster configuration:

1. **Replaced doom-modeline with mood-line** (modules/modeline-config.el)
   - Simplified from 70+ lines to ~10 lines (-40 lines net)
   - mood-line is lightweight, minimal, inspired by doom-modeline
   - Better performance with no dependencies
   - Keeps all essential features: buffer status, major mode, VCS,
     flycheck, cursor position, multiple-cursors counters

2. **Removed deprecated tree-sitter package** (modules/prog-general.el)
   - Deleted `(use-package tree-sitter)`
   - Now relies solely on Emacs 29+ built-in treesit with treesit-auto
   - treesit-auto continues to manage grammars automatically
   - No functionality lost, cleaner dependency tree

Both changes serve Method 2: "Stop Problems Before They Appear"
- Simpler code = fewer bugs
- Fewer dependencies = less maintenance
- Native features = better integration

Updated todo.org to mark both tasks complete [2/5 in Method 2].

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

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