fix(update): apply --minimal-changes via policy preferred versions

The previous implementation pinned every resolved package back to its
locked version after the resolve, which discarded the new versions the
solver had to pick when a root constraint moved off the lock (e.g. a
require bumped from `1.*` to `2.*`). The lock effectively never moved,
so transitive cascades from a forced root-level update were lost.

Mirror Composer's `Installer::createPolicy(forUpdate=true,
minimalUpdate=true)` instead: thread the lock's `name → normalized
version` map through the policy as `preferred_versions`. The solver now
picks the locked version as a tiebreaker when it still satisfies the
active constraints, but moves freely when a constraint forces a
different version. Drop the post-process hook entirely.

1 files changed, 4 insertions, 0 deletions

diff --git a/crates/mozart/src/commands/remove.rs b/crates/mozart/src/commands/remove.rs
index f41d8b5..c52d410 100644
--- a/crates/mozart/src/commands/remove.rs
+++ b/crates/mozart/src/commands/remove.rs
@@ -278,6 +278,7 @@ pub async fn execute(
         locked_packages: Vec::new(),
         block_abandoned: false,
         root_branch_alias: None,
+        preferred_versions: indexmap::IndexMap::new(),
     };
 
     // Print header messages
@@ -565,6 +566,7 @@ async fn remove_unused(
         locked_packages: Vec::new(),
         block_abandoned: false,
         root_branch_alias: None,
+        preferred_versions: indexmap::IndexMap::new(),
     };
 
     console.info("Resolving dependencies to detect unused packages...");
@@ -922,6 +924,7 @@ mod tests {
             locked_packages: Vec::new(),
             block_abandoned: false,
             root_branch_alias: None,
+            preferred_versions: indexmap::IndexMap::new(),
         };
         let resolved = resolve(&request)
             .await
@@ -982,6 +985,7 @@ mod tests {
             locked_packages: Vec::new(),
             block_abandoned: false,
             root_branch_alias: None,
+            preferred_versions: indexmap::IndexMap::new(),
         };
         let resolved2 = resolve(&request2)
             .await