PRODUCTION SCENARIO
Your migration agent works through a 40-module codebase across a dozen sessions, each starting with an empty context window and often days apart. A module counts as migrated only once its integration tests pass, which is usually a session or two after its code is written. Later sessions re-explore code that earlier ones already mapped, and occasionally redo modules that were already finished.
Which memory design stops the repeated work?
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Answer: Have an initializer session write the progress log and checklist that later ones update
Deliberate setup is what the multisession pattern asks for: the first session writes the progress log and the feature checklist before any substantive work, every later session opens by reading them, and each session updates the log before it ends, with a module marked done only after end-to-end verification. A notes file per session fits independent investigations with no shared scope; here no file is authoritative about which modules have passed their tests, which is how a finished module gets redone. Raising the context editing trigger keeps results alive inside one session, and every session here starts empty. A cached prefix answers a repeated preamble, and it stores no state a later session can write back.