Chore: move paperless_text parser and tests to paperless/

Move TextDocumentParser and its test suite from paperless_text/ into the
new paperless/ package where parsers are being consolidated:

- paperless_text/parsers.py → paperless/parsers/text.py
- paperless_text/tests/test_parser.py → paperless/tests/parsers/test_text_parser.py
- paperless_text/tests/conftest.py → paperless/tests/parsers/conftest.py
- paperless_text/tests/samples/*.txt → paperless/tests/samples/text/

Also add paperless/tests/__init__.py, paperless/tests/parsers/__init__.py,
and a new top-level paperless/tests/conftest.py for shared fixtures.

The parser and test files are unchanged; subsequent commits will update
them to implement ParserProtocol.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/paperless/tests/conftest.py

@@ -0,0 +1,48 @@
+"""
+Fixtures defined here are available to every test module under
+src/paperless/tests/ (including sub-packages such as parsers/).
+
+Session-scoped fixtures for the shared samples directory live here so
+sub-package conftest files can reference them without duplicating path logic.
+Parser-specific fixtures (concrete parser instances, format-specific sample
+files) live in paperless/tests/parsers/conftest.py.
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+import pytest
+
+from paperless.parsers.registry import reset_parser_registry
+
+if TYPE_CHECKING:
+    from collections.abc import Generator
+
+
+@pytest.fixture(scope="session")
+def samples_dir() -> Path:
+    """Absolute path to the shared parser sample files directory.
+
+    Sub-package conftest files derive format-specific paths from this root,
+    e.g. ``samples_dir / "text" / "test.txt"``.
+
+    Returns
+    -------
+    Path
+        Directory containing all sample documents used by parser tests.
+    """
+    return (Path(__file__).parent / "samples").resolve()
+
+
+@pytest.fixture(autouse=True)
+def clean_registry() -> Generator[None, None, None]:
+    """Reset the parser registry before and after every test.
+
+    This prevents registry state from leaking between tests that call
+    get_parser_registry() or init_builtin_parsers().
+    """
+    reset_parser_registry()
+    yield
+    reset_parser_registry()

src/paperless/tests/parsers/conftest.py

@@ -2,7 +2,6 @@ from collections.abc import Generator
 from pathlib import Path
 
 import pytest
-
 from paperless_text.parsers import TextDocumentParser