cardano-recon-framework: Replace crash-on-missing-key build flag with --on-missing-key CLI option
The compile-time `crash-on-missing-key` cabal flag is replaced by a runtime `--on-missing-key <crash|bottom>` CLI option (default: `bottom`). `next` now runs in `Reader OnMissingKey` and the value is threaded through `satisfies`/`satisfiesS` to all call sites. Co-Authored-By: Claude Sonnet 4.6 <[email protected]>