v0.2.0: feat: init --infer, check --fix with patch suggestions, change-heat lens

- archwhere init --infer drafts the model from the repo itself: directory
  structure, package.json workspaces, import edges, guessed kinds. The draft
  always passes 'archwhere check' (every tracked file mapped).
- archwhere check now suggests the exact model patch for unmapped files
  (adopt into nearest component by shared path prefix, or a new component),
  and --fix applies it. The PR comment carries the same suggestions, so
  agents can self-heal the map.
- archwhere heat + a Heat lens in mission control: components tinted by git
  churn over the last 30 days, with per-component change/file counts.
- v0.2.0; README updated; verified headless (zero page errors) and dogfooded
  on a real multi-process codebase (22 components inferred, check green).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DbzBUUWDJy8nLHvxc4VK3g