feat(installer): add trace recorder and topo install order

Adds TraceRecorderExecutor (Composer's InstallationManagerMock analog),
which records every install/update/uninstall as a string matching
Composer's *Operation::__toString output (after strip_tags) - the
load-bearing assertion target for in-process fixture tests.

Two changes were needed to make the recorder useful:

- InstallerExecutor::uninstall_package gains a version parameter, and
  install_from_lock now looks up both the uninstall and the
  Update-from-version from installed.json. Previously the Update path
  passed the new version as a placeholder; the recorder needs the real
  old version to emit `Upgrading pkg (old => new)`.

- compute_operations now topologically sorts the lock contents (deps
  before dependents) before computing actions, mirroring Composer's
  Transaction::calculateOperations. Without this, packages would
  install in alphabetical order and the trace would diverge from
  Composer's expectation.

Also adds crates/mozart/tests/installer_in_process.rs with the
in-process harness scaffold: parses the same .test fixtures, builds a
tempdir, calls commands::install::run / update::run with an empty
RepositorySet (no Packagist) and a TraceRecorderExecutor, then asserts
exit code + EXPECT trace. One fixture wired up: suggest_replaced - the
original CI failure that motivated this whole DI refactor. It now
passes on the in-process path because the empty RepositorySet makes
b/b unreachable just like Composer's `'packagist' => false` test
config, and the resolver finds c/c (which replaces b/b) via the inline
package repo's eager preload.

Step F will migrate every fixture currently in installer.rs to the new
harness; remaining divergences (alias handling, output ordering,
replace trace shape, etc.) will surface as individual follow-ups.

All 136 existing spawn-based fixtures + 114 mozart-registry tests +
541 mozart lib tests still green; clippy clean.

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

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