fix(resolver): reject partial update when locked version fails stability

A partial update reuses every non-allow-listed locked package as a
fixed pool entry, ignoring stability filters. So when a user tightens
`minimum-stability` (or drops a `stability-flags` entry the lock used
to ride on), Mozart silently kept the rejected version and produced a
plan Composer would have failed on. Mirror Composer's
`Pool::isUnacceptableFixedOrLockedPackage` path: walk the locked
packages before pool construction, surface every entry whose version
no longer passes `passes_stability_filter`, and bail with the same
"fixed to <v> (lock file version) ... rejected by your
minimum-stability" pointer Composer prints from
`Problem::getPrettyString`.

0 files changed, 0 insertions, 0 deletions