docs(load-graph): classify elfeed-config, the last init module

elfeed-config was the only init module without a load-graph header. It was deferred because annotating the header triggers a byte-compile, which broke its tests. With that test rewritten to use real structs, I added the header (Layer 4, optional, currently eager but a command-loaded deferral candidate, runtime requires user-constants, system-lib, media-utils), added elfeed-config to the header-contract allowlist, and moved it from the inventory's deferred and pending sections into the Batch 8 table.

That brings the inventory to 102 of 102 modules classified, completing the Phase 1 classification pass.

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