Architect audit clean (no drift): the derive is the faithful C10 book
first-difference — Close uses the stored book volume (the actual book), never an
exposure delta (the exact inversion of the abandoned 0064 exposure-integral);
post-run reduction, no in-graph node (C14), positional type-erased Scalar reads
(C7), each event's event_ts is its own cycle (C2), the >1-event-per-instant
reversal case is why it is derived not per-eval (C8/C10); aura-engine -> aura-core
only (instrument_id a caller scalar, no InstrumentSpec import).
- Ledger C10: add a "Realization (cycle 0068, #115)" note — derive_position_events
as the first difference of the executed book, the post-reframe replacement for
the rolled-back 0064 derive; fixed-fractional / currency / equity-feedback
sizing and the realistic brokers stay #116.
- Remove the ephemeral spec + plan (cycle closed; rationale in the ledger + git
history).
Accepted low debt (architect [low]): the stop-then-same-cycle-reopen producer path
emits the same closed&&open shape as a bias-flip reversal and the derive handles it
correctly (it keys on closed/open/direction/size, not exit_reason; unit-covered via
the reversal test), but is not separately asserted end-to-end. Cosmetic; the derive
is producer-agnostic.
refs #115
Brummel
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