Validation evidence: v4: Make Fix node (recreate) work inside a subgraph

Implementation: b3821788851e2a6b6860af14a5246a4a6802e4a4 on fix/v4-node-fixer-subgraph, targeting manager-v4.

v4-node-fixer-subgraph-pr-assets/annotated/: the captures with boxes and captions laid over them
v4-node-fixer-subgraph-pr-assets/screens/: the unmodified browser captures
v4-node-fixer-subgraph-pr-assets/evidence.json: what was captured, from which node_fixer.js, with hashes
v4-node-fixer-subgraph-pr-assets/capture_evidence.cjs: the script that made the captures
manifest.json: checksums of the files here