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.

5 files changed, 17 insertions, 42 deletions

diff --git a/crates/shirabe/src/repository/vcs/forgejo_driver.rs b/crates/shirabe/src/repository/vcs/forgejo_driver.rs
index 3c1366d..a40f6a9 100644
--- a/crates/shirabe/src/repository/vcs/forgejo_driver.rs
+++ b/crates/shirabe/src/repository/vcs/forgejo_driver.rs
@@ -347,9 +347,10 @@ impl ForgejoDriver {
         if !self.inner.info_cache.contains_key(identifier) {
             let composer = if self.inner.should_cache(identifier) {
                 if let Some(res) = self.inner.cache.as_mut().and_then(|c| c.read(identifier)) {
-                    // TODO(phase-b): JsonFile::parse_json returns PhpMixed; convert into Option<IndexMap>
-                    let _ = JsonFile::parse_json(Some(res.as_str()), None)?;
-                    None
+                    let parsed = JsonFile::parse_json(Some(res.as_str()), None)?;
+                    parsed
+                        .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 c = VcsDriverBase::finish_base_composer_information(
diff --git a/crates/shirabe/src/repository/vcs/git_bitbucket_driver.rs b/crates/shirabe/src/repository/vcs/git_bitbucket_driver.rs
index 3f0be13..f8cfd7a 100644
--- a/crates/shirabe/src/repository/vcs/git_bitbucket_driver.rs
+++ b/crates/shirabe/src/repository/vcs/git_bitbucket_driver.rs
@@ -239,7 +239,6 @@ impl GitBitbucketDriver {
             .and_then(|v| v.as_string())
             .map(String::from);
 
-        // TODO(phase-b): unwrap PhpMixed::Array into the typed IndexMap stored on self
         self.repo_data = match repo_data {
             PhpMixed::Array(m) => m.into_iter().map(|(k, v)| (k, *v)).collect(),
             _ => IndexMap::new(),
@@ -262,18 +261,9 @@ impl GitBitbucketDriver {
             if self.inner.should_cache(identifier) && {
                 let res = self.inner.cache.as_mut().and_then(|c| c.read(identifier));
                 if let Some(res) = res {
-                    // TODO(phase-b): wrap parsed PhpMixed::Array into the IndexMap-shaped composer slot
-                    composer = 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(),
-                    );
+                    composer = JsonFile::parse_json(Some(&res), None)?
+                        .as_array()
+                        .map(|m| m.iter().map(|(k, v)| (k.clone(), (**v).clone())).collect());
                     true
                 } else {
                     false
diff --git a/crates/shirabe/src/repository/vcs/github_driver.rs b/crates/shirabe/src/repository/vcs/github_driver.rs
index 6fc50ee..45ba7b7 100644
--- a/crates/shirabe/src/repository/vcs/github_driver.rs
+++ b/crates/shirabe/src/repository/vcs/github_driver.rs
@@ -279,7 +279,6 @@ impl GitHubDriver {
                     .as_mut()
                     .and_then(|c| c.read(identifier))
                     .unwrap_or_default();
-                // TODO(phase-b): cached payload is JSON string; parse to PhpMixed -> Option<IndexMap>
                 let parsed = JsonFile::parse_json(Some(&res), None)?;
                 parsed
                     .as_array()
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(
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)
     }