feat: mdgrep 0.1.0 – boolean full-text search for Markdown

- query language: substrings, phrases, /regex/, AND/OR/NOT (+ UND/ODER/NICHT),
  parentheses; case-insensitive; ReDoS protection via regex timeouts;
  syntax errors with stable code and position
- SearchEngine over in-memory blocks: filters, predicate, grouping, sorting,
  paging, time budget, automatic reload, highlighted snippets
- Markdown loader with split modes file/heading/list/paragraph
- grep-like CLI (mdgrep), JSON output, grep exit codes
- Flask blueprint/app with JSON API and widget assets, dev server
- framework-free JS widget: live search, URL state, filters, paging,
  syntax help, en/de labels, CSS custom properties for theming

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/docs/languages.md

@@ -0,0 +1,13 @@
+# Programming languages
+
+## Systems
+
+- **Rust** guarantees memory safety without a garbage collector. Its borrow checker
+  rejects data races at compile time.
+- **Go** favours simplicity and fast compilation; goroutines make concurrency cheap.
+- **Zig** offers manual memory management with compile-time code execution.
+
+## Scripting
+
+- **Python** is popular for data science and machine learning (LLMs, PyTorch).
+- **Lua** is a tiny embeddable language used in games and Neovim.