feat(freeze): no authors in the config, no author check

A repository that takes commits from people it cannot list has no way
to freeze a range today: a null `authors` falls back to
`git config user.email`, so every foreign author or committer fails.
Null, or no key, now means neither is checked; the freeze warns that it
did not check them and records `authors` as null. A list is checked as
before. An empty list, which no commit could pass, is a config error
that points at null.
Released as 1.1.0.

interfaces/Crafter.Review-Config.cppm

@@ -36,10 +36,9 @@ export namespace Crafter::Review::Config {
     // The config for a dump: the database URL with its password masked, no
     // `_` bookkeeping keys.
     Json Redacted(const Json& config);
-    // The emails the freeze accepts: the configured list, else the
-    // repository's git identity.
-    std::vector<std::string> Authors(const Json& config, const std::filesystem::path& repo);
-    std::string GitUserEmail(const std::filesystem::path& repo);
+    // The emails the freeze accepts as author and committer: the configured
+    // list; none (null, or no `authors` key) - the freeze checks neither.
+    std::optional<std::vector<std::string>> Authors(const Json& config);
     // The lens files no mode lists (what runs nowhere: the slots and init).
     std::vector<std::string> LensesOff(const Json& config);
     // {lens file: environment} for every lens of the table, as the config

interfaces/Crafter.Review-Freeze.cppm

@@ -56,7 +56,8 @@ export namespace Crafter::Review::Freeze {
         bool replace = false;
         bool worktree = false;
         bool requireSigned = false;
-        std::vector<std::string> authors;
+        // The emails author and committer must be among; none: not checked.
+        std::optional<std::vector<std::string>> authors;
         std::string aiTrailers = "forbid";
         std::vector<std::string> allowDirty;
         std::optional<std::string> configBase;