fix(install): emit MarkAliasUninstalled and fix dev-branch upgrade direction

Two pieces of Composer's update-trace machinery were missing:

1. VersionParser::isUpgrade in Composer\Package\Version (which overrides
   the upstream Semver one) substitutes dev-master / dev-trunk /
   dev-default with the 9999999-dev default-branch alias, then returns
   true whenever either side starts with `dev-`. Mozart's is_upgrade
   compared via the generic version order, so dev-master → dev-foo came
   out as Downgrading. Port the override.

2. Transaction::calculateOperations seeds removeAliasMap from the
   currently-installed AliasPackages and emits MarkAliasUninstalled for
   every entry not covered by the new lock. Mozart never emitted those,
   so updating away from a branch-aliased package produced no trace
   line for the alias retirement. Walk installed.json's
   `extra.branch-alias` map, compare against the new lock's aliases[]
   block, and emit a MarkAliasUninstalled PackageOperation (a new
   variant on the executor surface — no filesystem effects, only the
   trace recorder cares).

Unblocks update_alias, update_alias_lock2, and update_no_dev_still_resolves_dev
installer fixtures.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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