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>

tests/test_cli.py

@@ -0,0 +1,60 @@
+import json
+
+import pytest
+
+from mdgrep.cli import main
+
+
+@pytest.fixture
+def docs(tmp_path):
+    (tmp_path / "a.md").write_text("# A\n\nRust is fast.\n\nGo is simple.\n", encoding="utf-8")
+    (tmp_path / "b.md").write_text("- rust crypto wallet\n- python typing\n", encoding="utf-8")
+    return tmp_path
+
+
+def run(capsys, *args):
+    code = main([*args, "--color", "never"])
+    out, err = capsys.readouterr()
+    return code, out, err
+
+
+def test_match_output_and_exit_code(capsys, docs):
+    code, out, _ = run(capsys, "rust -crypto", str(docs))
+    assert code == 0
+    assert f"{docs / 'a.md'}:3" in out
+    assert "Rust is fast." in out
+    assert "crypto" not in out
+
+
+def test_no_match_exit_1(capsys, docs):
+    code, out, _ = run(capsys, "haskell", str(docs))
+    assert code == 1 and out == ""
+
+
+def test_syntax_error_exit_2_with_caret(capsys, docs):
+    code, _, err = run(capsys, "(rust", str(docs))
+    assert code == 2
+    assert "Missing closing parenthesis" in err and "^" in err
+
+
+def test_count_and_files(capsys, docs):
+    assert run(capsys, "rust OR python", str(docs))[0] == 0
+    _, out, _ = run(capsys, "rust OR python", str(docs), "--split", "list", "-c")
+    assert out.strip() == "3"
+    _, out, _ = run(capsys, "rust", str(docs), "-l")
+    assert out.split() == [str(docs / "a.md"), str(docs / "b.md")]
+
+
+def test_json_output(capsys, docs):
+    code, out, _ = run(capsys, "/fa.t/", str(docs), "--json")
+    data = json.loads(out)
+    assert code == 0 and data["total_blocks"] == 1
+    block = data["results"][0]["block"]
+    assert {"t": "fast", "hit": True} in block["segments"]
+    assert "markdown" not in block["meta"]
+
+
+def test_color_highlight(capsys, docs):
+    main(["rust", str(docs / "a.md"), "--color", "always"])
+    out = capsys.readouterr().out
+    assert "\033[1;31mRust\033[0m" in out