plox: lazy-trust verifiable, on-PDS bulk did:plc operation archival

tl;dr: plox is a canonical encoding of the did:plc directory, stored in an atproto PDS. as of may 2026 at://cerulea.blue/blue.cerulea.plox.bundle is taking up 35 GB on disk ( zstd -compressed; ≈80 GB raw). you can use it to bootstrap a PLC directory mirror in minutes rather than hours, and since anyone can recompute and verify the plox CIDs against the canonical plc.directory, we have lazy-trust…