Add the Sillitoe SDMS as a second mastering lathe candidate

Sillitoe Audio Technology (Australia) sells a complete cutting system:
lathe, MMFB feedback cutterhead, cutting amplifier, Space / Time Control
automation with a virtual groove, vacuum and microscope, at a published
USD 125,000 ex tax and shipping. Vendor landscape gets the narrative and
an Agnew-or-Sillitoe comparison; supplier map, total investment basis,
roadmap item 13 and the digital factory's no-telemetry section (STC cue
sheet, Open Groove export, stylus hours) follow.

docs/suppliers/equipment-suppliers.md

@@ -25,9 +25,10 @@ Suppliers identified:
 | Supplier | Location | Offering | Notes |
 |---|---|---|---|
 | Agnew Analog | Chalkis, Greece | Type 612 lathe, Type 602 cutter head, Type 607 stylus machine, tube electronics | Bespoke, long build times; turnkey or components; info@agnewanalog.com |
+| Sillitoe Audio Technology | Australia | SDMS complete cutting system: lathe, MMFB Mk3E feedback cutterhead, Master Control cutting amplifier, Space / Time Control automation software, vacuum, groove microscope | **USD 125,000** standard system ex tax and shipping (order page, October 2026); built to order; closed head/amplifier pairing; info@sillitoeaudiotechnology.com. Comparison in [vendor landscape](vendor-landscape.md) |
 
-Open: cutter amps, console, preview automation, lacquer blank supply
-(e.g. MDC/Public Record type), styli supply.
+Open: cutter amps and preview automation (both bundled if Sillitoe),
+console, lacquer blank supply (e.g. MDC/Public Record type), styli supply.
 
 ## 2. Silvering and Electroforming (Galvanics)