feat: the crafter-review skeleton, and its semantics for text, JSON and crypto

What the rest of crafter-review stands on.

- project.cpp: a static crafter.review-lib and the crafter-review
  executable; Crafter.Network without QUIC, pinned, or with --local from
  the checkout next to this one; Crafter.LintRules' lite rules, pinned;
  the version from CRAFTER_REVIEW_VERSION, git describe or 0.0.0-dev.
- :Core and :Driver: the version, PromptVersion 1, --version.
- :Json: nlohmann's ordered_json, which keeps key order and unknown keys,
  so the files every driver on a machine shares survive a rewrite; dumps
  in the indented file layout, the spaced one-line form and the compact
  sorted form the structured-output schema needs byte for byte.
- :Crypto: SHA-256/SHA-1/MD5, HMAC, PBKDF2 through libcrypto; base64 and
  base32 written out, because what they refuse, and with which message,
  is pinned.
- :Unicode, Unicode 16.0.0's tables: whitespace, line breaks, decimal
  digits, printable characters, case mappings and case-insensitive folds.
- :Text: string functions on code points, number parsing, the shortest
  float form and half-even rounding, printed values, shell patterns, URL
  splitting and unquoting, POSIX paths, universal newlines and the
  replacing UTF-8 decoder.

Tests: Crypto (published vectors), Text (293 reference vectors).

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

implementations/Crafter.Review-Core.cpp

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+// SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
+
+module Crafter.Review:Core_impl;
+import :Core;
+import std;
+
+namespace Crafter::Review {
+    std::string_view Version() {
+        return CRAFTER_REVIEW_VERSION;
+    }
+
+    std::string DriverLine() {
+        return std::format("crafter-review {} (prompt v{})", Version(), PromptVersion);
+    }
+}