Preprint package for a synthetic human-in-the-loop case study across MCP, EUDI Wallet-style credentials, X-Road, SPIFFE/SPIRE, Rekor, Vault transit, and post-quantum signatures. The package contains the manuscript source, generated color figures, public-clean evidence summaries, case matrices, reproducibility notes, adjacent-case manifest, and checksum material. The work frames agent evidence as predicate-level evidence graphs and treats PKI as governance infrastructure adjacent to agentic public-service systems.