feat(phase-c): resolve PhpMixed-conversion phase-b TODOs

Implement the foundational PhpMixed conversion infrastructure
(From<bool|i64|f64|String>, order-sensitive PartialEq matching PHP ===)
and resolve the category-G phase-b TODOs that depend on it:

- Fix VCS driver cache paths that discarded parsed JSON or diverged on
  null caches (svn/forgejo/gitlab/git-bitbucket/github).
- Wire up real conversions previously stubbed or dropped: suggests
  platform config, audit ignore-severities, composer_repository search
  and ProviderInfo, class_loader prefix/classmap merges, locker lock
  diff comparison, advisory JSON serialization, SPDX license fields.
- Make GenericRule take a typed ReasonData; populate RULE_ROOT_REQUIRE
  with the constraint and convert PhpMixed at the call sites.

1 files changed, 3 insertions, 12 deletions

diff --git a/crates/shirabe/src/repository/vcs/gitlab_driver.rs b/crates/shirabe/src/repository/vcs/gitlab_driver.rs
index 84961f5..97dcc30 100644
--- a/crates/shirabe/src/repository/vcs/gitlab_driver.rs
+++ b/crates/shirabe/src/repository/vcs/gitlab_driver.rs
@@ -275,18 +275,9 @@ impl GitLabDriver {
                     .as_mut()
                     .and_then(|c| c.read(identifier))
                     .unwrap_or_default();
-                // TODO(phase-b): cached payload is wrapped to satisfy outer Option type
-                Some(
-                    JsonFile::parse_json(Some(&res), None)?
-                        .as_array()
-                        .cloned()
-                        .map(|m| {
-                            m.into_iter()
-                                .map(|(k, v)| (k, *v))
-                                .collect::<IndexMap<String, PhpMixed>>()
-                        })
-                        .unwrap_or_default(),
-                )
+                JsonFile::parse_json(Some(&res), None)?
+                    .as_array()
+                    .map(|m| m.iter().map(|(k, v)| (k.clone(), (**v).clone())).collect())
             } else {
                 let file_content = self.get_file_content("composer.json", identifier)?;
                 let composer = VcsDriverBase::finish_base_composer_information(