fix(remove): align with Composer's RemoveCommand pipeline

- Match exact deprecation wording for --update-with-dependencies and
  drop the false deprecation warning for -W/--update-with-all-dependencies
- Append --with-all-dependencies / --with-dependencies flag suffix to the
  "Running composer update" echo (mirrors PHP's \$flags variable)
- Drop validate_package_name bail so glob-style names fall through to the
  "not required in your composer.json" warning, matching Composer
- Always run the install pipeline after the JSON edit even when nothing
  changed (removes the if !any_removed short-circuit)
- Capture composer_backup before any mutation and restore it on pipeline
  failure with the "Removal failed, reverting" error message
- After install, read vendor/composer/installed.json and return exit 2
  if any removed package is still present (mirrors Composer's local-repo
  query at RemoveCommand.php L303-311)
- Fix remove_unused: bail with Composer's exact error when no lock file
  present; use "No unused packages to remove" (no period) for empty case
- Rename raw -> composer, any_removed -> packages_removed to mirror PHP

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

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