Archive the father as well as the mother; how many represses a mother carries

Decided (October 2026): the plant keeps the father and the mother of every
side. production-timeline.md (repress section) records the decision and the
rule of thumb with sources: about 10 stamper sets per mother before it
degrades (Third Man Pressing FAQ, a Nashville plater via WPLN), fewer in
quality-minded sources (5 VinyLab, 6 to 8 Stereo Review 1962); a father
grows about 5 to 10 mothers. So a mother covers roughly ten represses
(10,000 to 20,000 records a side) and a worn one is replaced from the
archived father without a new cut. galvanics.md: 4 archived parts per
title, ~1,200 to 2,400 a year; new open question to all galvanics
candidates (sets per mother, mothers per father, storage).
artist-platform.md repress paragraph.

Demos: make-a-record and artist-order say father and mother are archived;
factory console archives the father on represses too, counts stamper sets
per mother (shown in the genealogy and the customer's metal card), and the
metal archive counts fathers and mothers.

docs/equipment/galvanics.md

@@ -306,6 +306,16 @@ The count, from this repo's own demand figures:
   (at 1,000 to 2,000 pressings per stamper): 8 to 10 electroformed parts per
   title, **~2,400 to 6,000 parts a year**, 8 to 20 per working day at 300
   days, before remakes.
+- The father and the mother of every side go into the archive (decided
+  October 2026): 4 parts per title, **~1,200 to 2,400 parts a year** at 300
+  to 600 titles. A mother carries about 10 stamper sets and a father about
+  5 to 10 mothers by the industry rule of thumb (sources and the repress
+  arithmetic in the
+  [production timeline](../production-timeline.md#repress-the-shortest-path-in-the-plant)),
+  so a repress normally grows stampers from the archived mother, and a
+  worn mother is replaced from the father without a new cut. The room
+  that holds them is planned in
+  [facility security](../facility-security.md#protecting-the-irreplaceable).
 - With ~15 minutes of loading, rinsing and unloading on top of 45 to 75
   minutes of deposition, a cell turns a part in ~1 to 1.5 hours: 10 to 16
   parts per cell per two-shift day, **20 to 32 per PDPU**.
@@ -482,6 +492,11 @@ goes ahead.
   equipment on offer; installations and service in Asia; stamper service
   prices and turnaround; which water-treatment partner his customers use;
   and whether OMS builds the electroplating equipment Newbilt announces.
+- **All galvanics candidates** (Pheenix, Digital Matrix, OMS): how many
+  stamper sets a mother gives and how many mothers a father gives with
+  their process before quality drops, how they check it (mother playback,
+  metrology), and how they recommend storing archived fathers and mothers
+  (passivation, sleeves, humidity) for years.
 - **Press vendors** (Newbilt, Pheenix, M-Tech): the stamper centre hole and
   edge form each mould expects, so the punch size and coiner tooling can be
   ordered to match ([pressing line](pressing-line.md)).