refactor: split the repo into self-contained validator, directory, quickstart, spec and site folders

validator/ holds mewslint (lint, css, fetch, DTD/CSS data); directory/ holds
the mews.page service (app, db, check, pages, cli) and depends on validator/;
quickstart/ holds mews-quickstart and md2mews.py for third parties who want
to create Mews content without cloning the repo; spec/ consolidates doc/ and
dtd/ with the canonical mews-0.1.css; site/ becomes a Pelican project with
the forward-facing pages as Markdown, the check form kept as a raw HTML
snippet. Root pyproject.toml is now a virtual uv workspace over validator,
directory and quickstart, with cross-cutting tests that span more than one
of them staying at the repo root. Makefile and flake.nix updated to match.

tests/test_site.py

@@ -1,6 +1,7 @@
 """The project's own pages. Every one of them has to follow the spec."""
 
 from pathlib import Path
+import shutil
 import subprocess
 import sys
 
@@ -9,18 +10,48 @@ import pytest
 from mews.lint import validate_file
 
 ROOT = Path(__file__).resolve().parent.parent
-PAGES = [*sorted((ROOT / "site").glob("*.html")), ROOT / "sample" / "sample.html"]
+SITE = ROOT / "site"
 
 
-@pytest.mark.parametrize("page", PAGES, ids=lambda p: p.name)
-def test_the_projects_own_pages_conform(page):
-    report = validate_file(str(page))
+@pytest.fixture(scope="session")
+def built_site():
+    """Build the Pelican site once per test session, and return its output dir."""
+    result = subprocess.run(
+        [shutil.which("uv"), "run", "pelican", "content", "-o", "output"],
+        cwd=SITE,
+        capture_output=True,
+        text=True,
+        check=False,
+    )
+    assert result.returncode == 0, result.stderr
+    return SITE / "output"
+
+
+@pytest.mark.skipif(shutil.which("uv") is None, reason="uv is not installed")
+@pytest.mark.slow
+def test_the_sites_own_pages_conform(built_site):
+    pages = sorted(built_site.glob("*.html"))
+    assert pages, "the site build produced no pages"
+    for page in pages:
+        report = validate_file(str(page))
+        assert report.conforms, "\n".join(str(f) for f in report.failures)
+
+
+@pytest.mark.skipif(shutil.which("uv") is None, reason="uv is not installed")
+@pytest.mark.slow
+def test_the_sites_own_pages_have_no_warnings_either(built_site):
+    for page in sorted(built_site.glob("*.html")):
+        report = validate_file(str(page))
+        assert not report.warnings, "\n".join(str(f) for f in report.warnings)
+
+
+def test_the_sample_page_conforms():
+    report = validate_file(str(ROOT / "sample" / "sample.html"))
     assert report.conforms, "\n".join(str(f) for f in report.failures)
 
 
-@pytest.mark.parametrize("page", PAGES, ids=lambda p: p.name)
-def test_the_projects_own_pages_have_no_warnings_either(page):
-    report = validate_file(str(page))
+def test_the_sample_page_has_no_warnings_either():
+    report = validate_file(str(ROOT / "sample" / "sample.html"))
     assert not report.warnings, "\n".join(str(f) for f in report.warnings)
 
 
@@ -37,9 +68,9 @@ def test_pages_the_pelican_plugin_produces_conform(page):
 
 
 def test_the_dtd_still_matches_the_spec():
-    """dtd/check_dtd.py is hand-maintained; keep it running in CI."""
+    """spec/check_dtd.py is hand-maintained; keep it running in CI."""
     result = subprocess.run(
-        [sys.executable, str(ROOT / "dtd" / "check_dtd.py")],
+        [sys.executable, str(ROOT / "spec" / "check_dtd.py")],
         capture_output=True,
         text=True,
         check=False,