Adapter Guide Skill

When working on the adapter layer or related crates, always read and follow the guidance in doc/developer/guide-adapter.md before making changes. That document contains correctness invariants, architectural notes, and a list of optimizations that have been tried and rejected for correctness reasons.

Read doc/developer/guide-adapter.md now.

When working on the timestamp oracle (src/timestamp-oracle/), also read the module-level docs in src/timestamp-oracle/src/lib.rs and src/timestamp-oracle/src/batching_oracle.rs for the TimestampOracle trait contract and the batching/linearizability invariants.