Refresh datasheet and architecture diagrams to Workstation/Server structure

- build_nexus_one_ai_datasheet.py (root, outside cgit): new Product
  Structure section, Server S/M/L/Max tier table (was Starter/Basic/Pro/
  Max), Platform Roadmap section (7 capabilities). Regenerated docx + pdf.
- architecture-overview.svg / technical-service-flow.svg: relabeled tier
  banner to Server S/M/L/Max, fixed stale terminology (Agent builder ->
  Agent Studio, Connector sync -> MCP & Enterprise Connector sync, Pro/Max
  -> Server L/Max), added a one-line Workstation callout in existing
  whitespace. Verified by rendering both to PNG before committing.
- docs/README.md: notes docx/pdf/SVGs are current; the 3 jpg visuals still
  need a design refresh (raster images, tracked as follow-up).

docs/architecture-overview.svg

@@ -1,6 +1,6 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="1600" height="1003" viewBox="0 0 1600 1003" role="img" aria-labelledby="title desc">
 <title id="title">Nexus One AI Architecture Overview</title>
-<desc id="desc">Business-style architecture figure showing entry point, experience layer, core services, control surfaces, and deployment substrate for Nexus One AI, scaled across commercial tiers.</desc>
+<desc id="desc">Business-style architecture figure showing entry point, experience layer, core services, control surfaces, and deployment substrate for Nexus One AI Server, scaled across the Server S/M/L/Max commercial tiers. Nexus One AI Workstation shares this same architecture as a standalone personal-appliance category.</desc>
 
   <defs>
     <marker id="arrowFlow" viewBox="0 0 14 14" refX="11" refY="7" markerWidth="8" markerHeight="8" orient="auto">
@@ -31,16 +31,16 @@
   <line x1="86" y1="214" x2="1514" y2="214" stroke="#E2E8F0" stroke-width="2"/>
 
 <rect x="86" y="258" width="1428" height="56" rx="12" fill="#16112B"/>
-<text x="104" y="248" fill="#8A7CA8" style="font:700 12px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;letter-spacing:0.14em;">SCALES BY COMMERCIAL TIER</text>
-<text x="108.0" y="282" fill="#FFFFFF" style="font:700 14.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">Starter</text>
+<text x="104" y="248" fill="#8A7CA8" style="font:700 12px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;letter-spacing:0.14em;">NEXUS ONE AI SERVER · SCALES BY COMMERCIAL TIER</text>
+<text x="108.0" y="282" fill="#FFFFFF" style="font:700 14.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">Server S</text>
 <text x="108.0" y="300" fill="#CBD5E1" style="font:400 12.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">1–5 users · NVIDIA RTX 5090, 32GB VRAM</text>
-<text x="465.0" y="282" fill="#FFFFFF" style="font:700 14.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">Basic</text>
+<text x="465.0" y="282" fill="#FFFFFF" style="font:700 14.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">Server M</text>
 <text x="465.0" y="300" fill="#CBD5E1" style="font:400 12.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">5–20 users · NVIDIA RTX Pro 6000, 96GB VRAM</text>
 <line x1="443.0" y1="270" x2="443.0" y2="302" stroke="#332952" stroke-width="1.5"/>
-<text x="822.0" y="282" fill="#FFFFFF" style="font:700 14.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">Pro</text>
+<text x="822.0" y="282" fill="#FFFFFF" style="font:700 14.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">Server L</text>
 <text x="822.0" y="300" fill="#CBD5E1" style="font:400 12.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">20–100 users · RTX Pro 6000 Blackwell, 288GB</text>
 <line x1="800.0" y1="270" x2="800.0" y2="302" stroke="#332952" stroke-width="1.5"/>
-<text x="1179.0" y="282" fill="#FFFFFF" style="font:700 14.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">Max</text>
+<text x="1179.0" y="282" fill="#FFFFFF" style="font:700 14.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">Server Max</text>
 <text x="1179.0" y="300" fill="#CBD5E1" style="font:400 12.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">100+ users · NVIDIA HGX H200, 1.1TB VRAM</text>
 <line x1="1157.0" y1="270" x2="1157.0" y2="302" stroke="#332952" stroke-width="1.5"/>
 <rect x="86" y="340" width="258" height="423" rx="18" fill="#F8F6FE" stroke="#ECE6FC" stroke-width="2"/>
@@ -96,5 +96,6 @@
 <text x="110" y="867" fill="#667085" style="font:400 14.5px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">CPU or NVIDIA GPU infrastructure · internal network / air-gapped friendly</text>
 <path d="M961.0 733.0 L961.0 809" class="ops"/>
 <path d="M1347.0 733.0 L1347.0 809" class="ops"/>
+<text x="86" y="912" fill="#8A7CA8" style="font:400 13px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">This architecture also ships as Nexus One AI Workstation — a standalone single-GPU personal appliance for 1–3 users, outside the Server tier ladder above.</text>
 <text x="86" y="933" fill="#98A2B3" style="font:400 13px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">Private AI packaged stack</text><text x="1514" y="933" text-anchor="end" fill="#98A2B3" style="font:400 13px Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;">Powered by Cezen</text>
 </svg>