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docs(ledger): record the tap-aware decimation refinement (#111) in the cut-2 note

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The cut-2 amendment described decimate as a pure min/max transform; #111 made the
per-bucket reduction tap-aware (mean for the bounded exposure, min/max for equity).
Keep the always-loaded design memory accurate; note #112 (bars/OHLC rendering) and
#110 as the remaining deferred refinements.

refs #111 #112
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Brummel
2026-06-22 14:35:10 +02:00
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@@ -1113,8 +1113,15 @@ transform thins the served page to ≤ ~2·`CHART_DECIMATE_BUCKETS` spine slots
multi-year M1 family now renders a few-thousand-point page instead of 100s of MB; full multi-year M1 family now renders a few-thousand-point page instead of 100s of MB; full
recorded data stays on disk (view-only), and the walk-forward null-fill page collapses recorded data stays on disk (view-only), and the walk-forward null-fill page collapses
for free. Deterministic (C1): pure bucketing over the sorted-deduped spine, no-op under for free. Deterministic (C1): pure bucketing over the sorted-deduped spine, no-op under
budget. Deferred refinements (#110): a `--width` budget flag (the budget is a fixed budget. **Refinement (#111, 2957561):** the per-bucket reduction is **tap-aware** — an
const) and true intra-bucket min/max ordering for the non-default continuous x-mode. *envelope* series (equity) keeps min/max, but a *bounded level* series (the C10
exposure, ∈[-1,+1]) reduces by per-bucket **mean** (a `ReduceKind` on each `Series`,
set by `reduce_for_tap`). Without it min/max made every multi-year exposure a solid
-1..+1 band (each bucket straddles many sign flips), reading as per-point oscillation;
the mean shows the net/duty-cycle level. Deferred refinements: rendering the min/max
envelope honestly as range bars / OHLC rather than a polyline (#112); a `--width`
budget flag and true intra-bucket min/max ordering for the non-default continuous
x-mode (#110).
### C23 — Graph compilation and behaviour-preserving optimisation ### C23 — Graph compilation and behaviour-preserving optimisation
**Guarantee.** The bootstrap (C19) is a **compilation**: it lowers a param-generic, **Guarantee.** The bootstrap (C19) is a **compilation**: it lowers a param-generic,