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A1 of the accumulator experiment: incrementally maintained, provenance- carrying artifacts over the event stream (signal / selection / fold / artifact), shipped as a packaged experiment. - New pure-logic workspace crate buzz-accumulator: selection-to-filter compilation with deterministic materialization, budgeted transcript rendering, zero-spend estimates (unknown model => honest None), plan_run/complete_run around a FoldRunner seam (subprocess claude -p v1 impl with sentinel/exit-code/timeout hardening), output-contract validation (exact H1 sections, cited within shown ids, >=1 citation, refuse => nothing persists), and the engine splice that retains append-section history by construction. 46 unit tests port the honesty invariants: coverage never seals unread, stall-don't-seal, prior citations never satisfy a new run. - New kinds in buzz-core: 30640 fold spec (parameterized replaceable, d = fold name) and 4640 artifact version (regular/immutable), both AUTHOR_ONLY_KINDS with NIP-44 content encrypted to self. - Relay: UsersWrite scope arms + global-only (never channel-scoped). - FTS privacy: both kinds excluded from search_tsv in schema.sql and brownfield migration 0041 (same shape as 0014/0033); embedded migrator tripwire extended. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Signed-off-by: Riley Crane <rileycrane@squareup.com>