docs: rename shn command references to npx @keygraph/shannon (#375)

apps/cli/src/commands/setup.ts

@@ -1,5 +1,5 @@
 /**
- * `shn setup` — interactive TUI wizard for one-time credential configuration.
+ * `npx @keygraph/shannon setup` — interactive TUI wizard for one-time credential configuration.
  *
  * Walks the user through selecting a provider and entering credentials,
  * then persists everything to ~/.shannon/config.toml with 0o600 permissions.

apps/cli/src/commands/uninstall.ts

@@ -1,5 +1,5 @@
 /**
- * `shn uninstall` command — remove ~/.shannon/ after confirmation (npx only).
+ * `npx @keygraph/shannon uninstall` command — remove ~/.shannon/ after confirmation (npx only).
  */
 
 import fs from 'node:fs';

apps/cli/src/config/resolver.ts

@@ -270,7 +270,7 @@ export function resolveConfig(): void {
     for (const err of errors) {
       console.error(`  - ${err}`);
     }
-    console.error(`\nRun 'shn setup' to reconfigure.\n`);
+    console.error(`\nRun 'npx @keygraph/shannon setup' to reconfigure.\n`);
     process.exit(1);
   }