refactor(capture-kit): relocate snapshot and recording zones into capture-kit

Move the ADR 0019 end-state capture zones into @agent-device/capture-kit:

- src/snapshot/** -> packages/capture-kit/src/snapshot/** (presentation,
  freshness, scroll-edge-state, ios-snapshot-runtime, android occlusion)
- src/recording/** -> packages/capture-kit/src/recording/**
- src/core/snapshot-{chrome,state,tree-ingestion,node-lookup}.ts ->
  packages/capture-kit/src/
- src/snapshot-quality/ test -> capture-kit presentation tree (directory
  retires with its last file)

Pure renames: import re-pointing and gate updates follow in the next commit.
The snapshot-desktop-surface test parks in src/__tests__/ because it pins
the root eager-import-closure walker.

Author: thymikee