Share embedded-map version admission and derive indexed overlap from represented mappings. Carry createRequire filename bases through worker facts and graph identity. Select factory export bindings at each bundler owner.
Validated accepted and malformed source maps through real CLI and stdio MCP codec workflows; verified loader and esbuild graph output against Node runtime controls. Rebased consumer checks passed.
Fixes#6803Fixes#6614Fixes#6798Fixes#6797