Patchwork 0.7.0

• Made the core Patchwork filesystem API synchronous and narrowed
  Patchwork.open to string paths; hook and CLI adapters remain asynchronous
  only where they run external processes.
• Reorganized implementation and tests by domain, split public result models by
  workflow, and separated pub parsing, package diagnostics, cleanup planning,
  and text/JSON presentation responsibilities.
• Reused one failure-safe package materializer across apply and overlay
  workflows, consolidated overlay discovery/resolution, and removed repeated
  marker scans and unchanged marker writes from multi-package activation.
• Split override YAML I/O from ownership reconciliation, reused one override
  editor per batch operation, and centralized normalized override-path logic.
• Made public result collections immutable snapshots, replaced stringly typed
  cleanup commands with CleanupCommand, and made Patchwork.open a factory.
• Moved apply and cleanup filesystem execution into domain executors so the
  public Patchwork class remains the composition root instead of a workflow
  implementation.
• Unified single-package and batch apply outcomes through ApplyResult, made
  source-tree hashing lazy, and kept each Patchwork instance on one workspace
  snapshot.
• Moved applied-state lifecycle rules under state, made package directory
  swaps failure-safe, and tightened cleanup and overlay path result semantics.
• Fixed dependency-override mirror precedence, overlay patch read diagnostics,
  and recursive gitignore wildcard handling found during review.