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, 0 insertions, 1 deletions

diff --git a/crates/shirabe/src/repository/artifact_repository.rs b/crates/shirabe/src/repository/artifact_repository.rs
index 1509de3..3715c27 100644
--- a/crates/shirabe/src/repository/artifact_repository.rs
+++ b/crates/shirabe/src/repository/artifact_repository.rs
@@ -203,7 +203,6 @@ impl ArtifactRepository {
             arr.insert("dist".to_string(), Box::new(PhpMixed::Array(dist)));
         }
 
-        // TODO(phase-b): load wants IndexMap<String, PhpMixed>; convert from PhpMixed::Array.
         let cfg: IndexMap<String, PhpMixed> = package
             .as_array()
             .cloned()