patchwork 0.5.0

• Added patchwork carry <pkg> [--from version] to carry stale patch files into
  current-version edit sessions for dependency upgrades.
• Removed patchwork.lock from root patch workflows. Patch files are now the
  committed patch truth; edit sessions keep hidden baselines under .patchwork/
  and applied output keeps generated ownership markers under .dart_tool/.
• Made CLI apply and undo refresh pub resolution by default, with
  --no-pub-get for scripts that need the lower-level filesystem step.
• Added patchwork remove and patchwork prune for safe cleanup of stale patch
  files, open edit directories, and Patchwork-owned generated state.
• Added doctor setup checks and explain-mode remediation details for project
  setup, generated state, and next-step guidance.
• Added overlay inspection for provider manifests, matched contributions,
  deduplication, and conflict diagnostics.
• Reduced build hook no-op noise when overlay manifests are absent.
• Split Patchwork internals around edit preparation, patch commits, applied
  output materialization/activation, dependency override state, status
  inspection, and overlay publishing.
• Reorganized README guidance around task-oriented workflows, generated state,
  CI, hooks, and provider overlays.