Squashed 'vendor/ruvector/' content from commit b64c2172

git-subtree-dir: vendor/ruvector
git-subtree-split: b64c21726f2bb37286d9ee36a7869fef60cc6900

crates/rvf/rvf-runtime/examples/qr_seed_encode.rs

@@ -0,0 +1,49 @@
+//! QR Cognitive Seed — Encode to QR Code
+//!
+//! Builds an RVQS seed payload and renders it as an SVG QR code.
+//!
+//! Run: cargo run --example qr_seed_encode -p rvf-runtime --features qr
+
+use rvf_runtime::qr_encode::{EcLevel, QrEncoder};
+use rvf_runtime::qr_seed::SeedBuilder;
+
+fn main() {
+    println!("=== QR Seed Encoder ===\n");
+
+    // Build a minimal RVQS seed payload.
+    let builder = SeedBuilder::new(
+        [0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08],
+        384,     // dimension
+        100_000, // total vectors
+    );
+
+    let (payload, header) = builder.build().expect("seed build");
+
+    println!("Seed payload: {} bytes", payload.len());
+    println!("  Magic:    0x{:08X}", header.seed_magic);
+    println!("  Version:  {}", header.seed_version);
+    println!("  Vectors:  {}", header.total_vector_count);
+    println!("  Dim:      {}", header.dimension);
+    println!();
+
+    // Encode as QR code. The 64-byte header fits easily in Version 2 with EC-M.
+    let code = QrEncoder::encode(&payload, EcLevel::M).expect("QR encode");
+
+    println!("QR Code:");
+    println!("  Version:  {}", code.version);
+    println!("  Size:     {}x{} modules", code.size, code.size);
+    println!();
+
+    // Render as ASCII for terminal display.
+    let ascii = QrEncoder::to_ascii(&code);
+    println!("{ascii}");
+    println!();
+
+    // Render as SVG.
+    let svg = QrEncoder::to_svg(&code);
+    println!("SVG output: {} bytes", svg.len());
+    println!("  Starts with: {}", &svg[..60]);
+    println!();
+
+    println!("=== Done ===");
+}