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/production-timeline.md

@@ -189,17 +189,33 @@ archived, a fresh stamper is pulled and the order runs:
 
 Two commercial consequences worth acting on:
 
-- **Choose the 3-step process and archive mothers.** Stamper Discs
-  offers both 1-step and 3-step. A 1-step stamper is faster and cheaper
-  for a one-off, but it is a single-use part: there is no mother to go
-  back to, so a repress restarts at lacquer cutting and costs the
+- **Choose the 3-step process and archive fathers and mothers.** Stamper
+  Discs offers both 1-step and 3-step. A 1-step stamper is faster and
+  cheaper for a one-off, but it is a single-use part: there is no mother
+  to go back to, so a repress restarts at lacquer cutting and costs the
   customer six weeks and a new cutting fee. 3-step buys the two-week
   repress, and that repress is the highest-margin order the plant will
-  ever take.
-- **The mother archive is an asset with a shelf life.** It needs the
+  ever take. Decided (October 2026): the plant keeps the **father as well
+  as the mother** of every side.
+- **How many represses a mother carries.** The common rule of thumb is
+  about **10 stamper sets per mother** before it degrades (Third Man
+  Pressing's FAQ; a Nashville plater quoted by WPLN, both checked October
+  2026); quality-minded sources give fewer: 5 (The VinyLab), 6 to 8
+  (Stereo Review, 1962, quoted on pspatialaudio.com). At 1,000 to 2,000
+  pressings a stamper that is roughly 10,000 to 20,000 records per side,
+  or about ten represses of a few hundred to 1,500 copies. A father grows
+  about 5 to 10 mothers (pspatialaudio.com; Third Man: up to 10), so with
+  the father archived a worn mother is replaced by plating a new one
+  (about an hour in the bath plus the listening check) instead of
+  re-cutting, and a title reaches roughly 50,000 to 100,000 records
+  before a new lacquer. These are industry rules of thumb, not this
+  plant's figures: the galvanics vendors are asked for theirs
+  ([galvanics](equipment/galvanics.md#open-questions-for-the-quotes)), and
+  the factory application counts stamper sets per mother.
+- **The archive is an asset with a shelf life.** It needs the
   storage conditions and the genealogy records that
   [traceability.md](traceability.md) already specifies, and a stated
-  retention policy — how long a customer's mothers are kept before
+  retention policy: how long a customer's fathers and mothers are kept before
   they are scrapped or returned. That policy does not exist yet and
   should be in the customer contract, not discovered later.