Design 26 and ADR 0608 §2-§4: the definitions are read at each trunk merge and pull request head
through the forge's get-file tool, parsed by mesh-sdk seatdef and kept in the state seat-definitions
by seat and source; seat-definition-changed is said, kept seven days, only when a digest moved. A
trunk definition that does not parse leaves the trunk's entry and writes seat-definition-unparsed;
a pull request's entries go when it closes or merges. A trunk build end naming out-of-step files
writes generated-types-out-of-step, cleared only by a clean build of the same module; the checker's
verdict keeps a pull request's. Tools indexer_seat_definition, indexer_seat_definitions_again (a hand
act) and indexer_out_of_step.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig
jschoubben
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