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.

dtd/check_dtd.py

@@ -1,102 +0,0 @@
-#!/usr/bin/env python
-"""Check mews-0.1.dtd against the XHTML Mobile 1.2 driver and the spec.
-
-The Mews DTD is maintained by hand. It cannot be generated by stripping
-xhtml-mobile12.dtd: that file is a driver which declares no elements (the
-declarations live in the W3C and OMA module files it points to), DTD
-attribute lists only ever add, a re-declared element is an error rather
-than an override, and the rules that define Mews (the head model of
-SPEC.md 3.3, the body variant classes of 5.3, the ban on nested tables
-of 4.2, and lang and dir) do not exist in XHTML-MP to be kept.
-
-This script verifies what the driver and the spec can check:
-
-- the driver is the expected XHTML Mobile 1.2 driver, with event
-  attributes included and bidi ignored, so lang and dir are Mews
-  extensions (SPEC.md 3);
-- the DTD declares exactly the elements SPEC.md 4.1 permits;
-- the DTD keeps the driver's pre content model verbatim;
-- the DTD keeps the li value and ol start attributes the driver adds.
-
-Run with: uv run check_dtd.py
-"""
-
-import re
-import sys
-from pathlib import Path
-
-ROOT = Path(__file__).resolve().parent
-DRIVER_PATH = ROOT / "xhtml-mobile12.dtd"
-DTD_PATH = ROOT / "mews-0.1.dtd"
-
-DRIVER_FPI = "-//OMA//DTD XHTML Mobile 1.2//EN"
-
-# The Mews element set (SPEC.md 4.1).
-KEPT_ELEMENTS = (
-    "html head title body "
-    "h1 h2 h3 h4 h5 h6 "
-    "p blockquote pre address hr "
-    "em strong b i code kbd samp var q cite abbr dfn br "
-    "a "
-    "ul ol li dl dt dd "
-    "table caption tr th td "
-    "img "
-    "form fieldset label input select option optgroup textarea "
-    "meta link"
-).split()
-
-
-def entity(text, name):
-    match = re.search(r"<!ENTITY\s+%\s*" + re.escape(name) + r'\s+"([^"]*)"', text)
-    return match.group(1).strip() if match else None
-
-
-def pre_content(text):
-    match = re.search(r'<!ENTITY\s+%\s*pre\.content\s+"(.*?)"\s*>', text, re.DOTALL)
-    return re.sub(r"\s+", " ", match.group(1)) if match else None
-
-
-def attlist(text, element):
-    match = re.search(r"<!ATTLIST\s+" + element + r"\s+(.*?)\n>", text, re.DOTALL)
-    return match.group(1) if match else None
-
-
-def main():
-    driver = DRIVER_PATH.read_text(encoding="utf-8")
-    dtd = DTD_PATH.read_text(encoding="utf-8")
-    errors = []
-
-    def check(condition, message):
-        if not condition:
-            errors.append(message)
-
-    check(entity(driver, "XHTML.version") == DRIVER_FPI, "driver is not XHTML Mobile 1.2")
-    check(
-        entity(driver, "xhtml-events.module") == "INCLUDE",
-        "driver must include event attributes; Mews drops them",
-    )
-    check(
-        entity(driver, "XHTML.bidi") == "IGNORE",
-        "driver must ignore bidi, so dir is a Mews extension",
-    )
-
-    declared = set(re.findall(r"<!ELEMENT\s+([\w:-]+)", dtd))
-    expected = set(KEPT_ELEMENTS)
-    check(
-        declared == expected,
-        f"elements differ from SPEC.md 4.1: {sorted(declared ^ expected)}",
-    )
-
-    check(pre_content(dtd) == pre_content(driver), "pre content model differs from the driver's")
-    check("value" in (attlist(dtd, "li") or ""), "li is missing the driver's value attribute")
-    check("start" in (attlist(dtd, "ol") or ""), "ol is missing the driver's start attribute")
-
-    if errors:
-        for message in errors:
-            print(f"error: {message}", file=sys.stderr)
-        sys.exit(1)
-    print(f"{DTD_PATH.name} matches the driver and SPEC.md 4.1 ({len(expected)} elements)")
-
-
-if __name__ == "__main__":
-    main()