codec/container with additional reconstruction information for archival? Are there (open source) codecs that support additional recovery information to be added during encoding to allow for an improved recovery from corruption?

Application would be data archival of videos - thus a somewhat overhead of ~10% is acceptable to be allow for a better error handling.
Typically, error correcting code (ECC) is added to the storage mechanism as with Reed-Solomon on DVD and Blu-ray and the modifications for forward error correction in DVB and ATSC transports. Another common video archival medium, LTO tape, has two levels of ECC. Building ECC into the codec would be redundant and wasteful, so they mostly focus on error concealment.