feat(tool-cordis): flatten the inspect plugins section to a capability list

The tree SHAPE was the wrong surface for the model: what it needs from
cordis_inspect is what services, plugins, and capabilities are loaded, not the
fiber hierarchy. The plugins section is now a flat name + lifecycle-state list
from ctx.registry (deterministically sorted, one line per instance); the ASCII
tree renderer, the parent→child rebuild, and the dyn-id tree annotation are
deleted — dynamic mounts keep their own richer dynamic section (id, state,
provides, waits). Net -49 lines; RFC and READMEs state the flat-list contract.

packages/cordis/tool-cordis/src/fiber-state.ts

@@ -1,7 +1,7 @@
 /**
  * Runtime mirror of the cordis `FiberState` const enum plus human-readable
  * labels, shared by the mount lifecycle (state reporting) and the inspect
- * renderers (tree and mount-table labels).
+ * renderers (plugin-list and mount-table labels).
  *
  * Cordis exposes `FiberState` as a `const enum`: there is no runtime object for
  * Node's type-stripping runner to import, so the members are mirrored here as