feat(cli): add serve as alias for studio subcommand (#891)

Both `agentv serve` and `agentv studio` now start the same Studio
dashboard. The `serve` alias better communicates "long-running HTTP
server" in deployment contexts (Dockerfile CMD, Kubernetes).

Closes #889

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: christso

apps/cli/src/index.ts

@@ -32,6 +32,7 @@ export const app = subcommands({
     pipeline: pipelineCommand,
     results: resultsCommand,
     self: selfCommand,
+    serve: resultsServeCommand,
     studio: resultsServeCommand,
     trace: traceCommand,
     transpile: transpileCommand,
@@ -60,6 +61,7 @@ const TOP_LEVEL_COMMANDS = new Set([
   'pipeline',
   'results',
   'self',
+  'serve',
   'studio',
   'trace',
   'transpile',