feat(notgraph): heatmap coloring, symbol counts, per-crate module graphs, cycle callouts

crates/notsecrets/examples/age_smoke.rs

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+use notsecrets::{Decryptor, Encryptor, X25519Identity, X25519Recipient};
+use rand::rngs::OsRng;
+use x25519_dalek::{PublicKey, StaticSecret};
+
+fn main() {
+    // 1. Generate a fresh keypair
+    let secret = StaticSecret::random_from_rng(OsRng);
+    let public = PublicKey::from(&secret);
+    let identity = X25519Identity::from_static_secret(secret);
+    let recipient = X25519Recipient::from_public_key(public);
+
+    println!("Recipient: {}", recipient.to_bech32());
+    println!("Identity:  {}", identity.to_bech32());
+
+    // 2. Build plaintext from env
+    let plaintext = [
+        (
+            "ANTHROPIC_API_KEY",
+            std::env::var("ANTHROPIC_API_KEY").unwrap_or_default(),
+        ),
+        (
+            "OPENAI_API_KEY",
+            std::env::var("OPENAI_API_KEY").unwrap_or_default(),
+        ),
+        (
+            "GEMINI_API_KEY",
+            std::env::var("GEMINI_API_KEY").unwrap_or_default(),
+        ),
+    ]
+    .iter()
+    .map(|(k, v)| format!("{k}={v}"))
+    .collect::<Vec<_>>()
+    .join("\n");
+
+    let plaintext = plaintext.as_bytes();
+
+    // 3. Encrypt
+    let encryptor = Encryptor::with_recipients(vec![Box::new(recipient)]).unwrap();
+    let ciphertext = encryptor.encrypt(plaintext).unwrap();
+
+    println!("\nCiphertext: {} bytes", ciphertext.len());
+    println!(
+        "Header:     {}",
+        std::str::from_utf8(&ciphertext[..22]).unwrap()
+    );
+
+    // 4. Write to file
+    let out_path = "/tmp/secrets.age";
+    std::fs::write(out_path, &ciphertext).unwrap();
+    println!("Written to: {out_path}");
+
+    // 5. Decrypt back
+    let decryptor = Decryptor::with_identities(vec![Box::new(identity)]);
+    let decrypted = decryptor.decrypt(&ciphertext).unwrap();
+    assert_eq!(decrypted, plaintext);
+
+    println!("\nDecrypted:\n{}", std::str::from_utf8(&decrypted).unwrap());
+    println!("\n✓ Round-trip success");
+}