Index entry + detail file. 'make.tcl libfetch' (G-139) fetches every
declared libpackages.toml artifact regardless of what the host or bake
consumes - already pinching on WSL (win32-x86_64 zips downloaded for a
linux-only bake; G-140 worked around it via the PUNK_LIBFETCH_CONFIG
test seam) and set to grow as G-004 migrates more vendored trees to
the punkbin lib tier. The goal derives the default fetch set from the
consumption declarations already in the tree (PACKAGES host needs +
the kit set's packages-sourced vfslibs targets) with narrow/widen
overrides, derivation reporting, and a VFSLIBS missing-source hint
naming the fetch the failing bake needs. Overlap survey recorded
(strongest live intersections G-127/G-115; relations
G-006/G-065/G-004/G-123/G-027).
Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com