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, 7 insertions, 13 deletions

diff --git a/crates/shirabe/src/repository/vcs/svn_driver.rs b/crates/shirabe/src/repository/vcs/svn_driver.rs
index 377d698..ef8787a 100644
--- a/crates/shirabe/src/repository/vcs/svn_driver.rs
+++ b/crates/shirabe/src/repository/vcs/svn_driver.rs
@@ -186,10 +186,13 @@ impl SvnDriver {
                     }
 
                     let parsed = JsonFile::parse_json(Some(res.as_str()), None)?;
-                    // TODO(phase-b): info_cache expects Option<IndexMap<String, PhpMixed>>;
-                    // PhpMixed → IndexMap conversion is non-trivial here. Skip insert/return.
-                    let _ = parsed;
-                    return Ok(None);
+                    let composer: Option<IndexMap<String, PhpMixed>> = parsed
+                        .as_array()
+                        .map(|m| m.iter().map(|(k, v)| (k.clone(), (**v).clone())).collect());
+                    self.inner
+                        .info_cache
+                        .insert(identifier.to_string(), composer.clone());
+                    return Ok(composer);
                 }
             }
 
@@ -253,15 +256,6 @@ impl SvnDriver {
             .info_cache
             .get(identifier)
             .and_then(|v| v.clone());
-        if cached.is_none()
-            || !is_array(
-                // TODO(phase-b): wrap IndexMap to PhpMixed for is_array check
-                &cached.clone().map(PhpMixed::from).unwrap_or(PhpMixed::Null),
-            )
-        {
-            return Ok(None);
-        }
-
         Ok(cached)
     }