fix(require): align with Composer's RequireCommand pipeline

- Add mozart-registry::version_selector::VersionSelector mirroring
  Composer\Package\Version\VersionSelector; wraps find_best_candidate
  and find_recommended_require_version_string for per-arg resolution
- Decompose execute() into named helpers matching Composer's structure:
  CommandState, revert_composer_file, get_inconsistent_require_keys,
  get_packages_by_require_key, update_file, update_file_cleanly (stub
  for PR 3), do_update, update_requirements_after_resolution (stub for PR 2)
- Fix firstRequire gating: compute first_require from the original file
  before applying changes; apply setUpdateAllowList only when
  !first_require and lock exists (prevents over-pinning on fresh projects)
- Add --fixed gate: bail when fixed && !dev && type != "project",
  matching Composer L173-189 wording verbatim
- Wire --no-security-blocking + COMPOSER_NO_SECURITY_BLOCKING env var
  into block_insecure in ResolveRequest (was always false)
- Wire COMPOSER_NO_AUDIT env var to skip audit step (tracked)
- Match Composer's revertComposerFile messaging: "deleting <file>" for
  newly-created, "reverting <file> and <lock> to their" / "to its" for
  existing files; also removes lock file on newly-created revert
- Auto-create "{\n}\n" when composer.json is missing or empty, mirroring
  Composer L138-152; delete file on dry-run cleanup (finally block)
- Add resolution-failure hint: "You can also try re-running mozart
  require with an explicit version constraint…" for unversioned packages
- Update deprecated-flag warnings to stderr (write_error) with
  Composer-matching wording for --no-suggest

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions