Add Pheenix galvanics flyers and Sibert stamper prep specs

docs/equipment/pheenix-alpha/: the four Pheenix Alpha electroforming flyers
(2024: PASU silvering, PPPU pre-plating, PDPU dual-cell plating, PMPB
passivation bench), renamed from their download hashes.
docs/equipment/sibert/: the VSP, VSF and VSC technical specifications
(2021), plus Sibert's 2008-09 optical-disc SPS literature and the 2008
Blu-ray stamper characteristics paper in sps-optical-disc-2009/. Two
byte-identical duplicates in the download were dropped.

New docs/equipment/galvanics.md, the metal-path counterpart to
pressing-line.md: datasheet tables for both ranges and what they change.
Pheenix is a second turnkey galvanics vendor next to Digital Matrix and
can quote lacquer-to-record as one vendor; neither range includes water
treatment. Utilities from the sheets (~27 kVA connected per line, DI water,
12-20 C cooling water, extraction sizes), ~5.6 m2 of footprint, and a cell
count estimate (one PDPU at the low end, two at the high end). The Sibert
machines are single-phase, 200/250/600 kg on castors, centre manually and
list no data interface; the VSC locates on the punched hole; the finisher's
water carries nickel. Weights, cycle times, prices and mould fit are listed
as quote questions.

Backlinks and small updates: README (bullet, layout tree, vendor list),
roadmap items 6 and 23, vendor landscape, supplier map, exhibitor briefing
(on-file notes, Sibert three-phase question answered), digital factory
(Pheenix PLC data, Sibert data question, RFQ clause 5), quality automation
(hardness on the centre slug, BD paper as the acceptance-spec model),
sustainability (finisher water), total investment block label (numbers
unchanged), scale (galvanics feeder note), crane weight table, process
flow, pressing-line stamper-fit question, plant page detail lines.

docs/roadmap.md

@@ -42,8 +42,12 @@ These three run in parallel and gate everything downstream:
 5. **Pheenix Alpha**: current metric datasheet and quotes for the AD12 and
    AD12 Manual, evaluating the single-vendor option against Newbilt for
    the semi-auto half
-6. **Digital Matrix**: galvanics line quote; in parallel, identify the
-   separate water-treatment vendor for the zero-discharge system
+6. **Galvanics quotes**: Digital Matrix, and Pheenix Alpha in the same
+   conversation as item 5 (it builds the electroforming line too), plus
+   Sibert prices for the stamper prep machines; equipment data in
+   [galvanics and stamper prep](equipment/galvanics.md). In parallel,
+   identify the separate water-treatment vendor for the zero-discharge
+   system
 7. **Thai utility RFQs** from the candidates in the
    [utilities CSV](finance/utilities-investment.csv), with guaranteed
    northern service response as a line item; resolve the 35% vs 45% RH
@@ -105,8 +109,9 @@ These three run in parallel and gate everything downstream:
 ## Phase 5: Expand (revenue-gated)
 
 22. Duplex expansion (second press and extruder are already quoted options)
-23. Galvanics line in-house (silvering, electroforming, stamper prep) with
-    the zero-discharge water plant; Stamper Discs moves to overflow/backup.
+23. Galvanics line in-house (silvering, electroforming, stamper prep; see
+    [galvanics and stamper prep](equipment/galvanics.md)) with the
+    zero-discharge water plant; Stamper Discs moves to overflow/backup.
     **Open question: should this move to Phase 1?** The August 2026 market
     evidence says the domestic bottleneck is imported metalwork, not press
     capacity, and that a galvanics line could earn from the incumbent's