v0.2.0

• Runtime imaging: the mounted plugin maintains $DSH_HOME/xray/runtime.json
  (1s-throttled, atomically replaced, refreshed on every internal/status
  transition and flushed on unload).
• deps: service dependency graph — providers from the reflect store (Impl
  records), consumers from inject declarations, transitive disable-cascade,
  unsatisfied injects.
• health: per-fiber lifecycle state (PENDING/LOADING/ACTIVE/FAILED named
  from the Cordis enum), startup errors, transition history. Exits 1 on any
  unhealthy plugin.
• xray_composition agent tool (views: summary/deps/health): agents can
  introspect their own capability set.