Update deployment target in Agents CLI command

[cfisher440]

agent_engine is not a valid option. It has to be either agent_runtime, cloud_run, gke, or none.

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[joefernandez]

thanks for the update!

[joefernandez]

Technical review report

• Review Score: 98
• Overall assessment: 🟢 Low Risk
• Summary reasoning: The change is a correct one-word bug fix. The old value agent_engine is not an accepted choice for --deployment-target in the currently released Agents CLI (v1.6.1); the flag is a click.Choice over DEPLOYMENT_TARGETS, whose keys are exactly agent_runtime, cloud_run, gke, none (template.py#L398-L415, wired in at cli_options.py#L86-L91). The documented command as it stands today therefore fails with a Click usage error; the PR makes it run. There is no alias mapping agent_engine to agent_runtime anywhere in the scaffold path.
• Recommended action: Approve. The fix corrects a command that cannot execute as documented, and agent_runtime is the right replacement for a page about deploying to Agent Runtime. The only findings are two pre-existing staleness issues elsewhere on the same page, outside this diff.
• Number of lines changed: XS, 1
• Number of files changed: 1

🟢 Low risk items

• Pre-existing, not in this diff — stale config file name. agents-cli.md:167 says "The command reads your deployment_target from pyproject.toml". In v1.6.1, agents-cli deploy dispatches on the target in agents-cli-manifest.yaml (cmd_deploy.py#L556, error text at #L148); the [tool.agents-cli] section in pyproject.toml is explicitly legacy and gets migrated out (upgrade.py#L763). Suggested change:

  ```suggestion
      The command reads your `deployment_target` from `agents-cli-manifest.yaml`
      and deploys
  ```

• Pre-existing, not in this diff — stale generated-project listing. agents-cli.md:208 shows app/agent_engine_app.py in the post-scaffold tree. No file matching agent_engine_app* exists anywhere in the v1.6.1 scaffold templates, and the listing omits the agents-cli-manifest.yaml that the base template now writes (base_templates/_shared/agents-cli-manifest.yaml). Worth a follow-up refresh of that block; it does not block this PR.

Nothing else: the changed line is the only occurrence of a --deployment-target value in the repo, so no sibling page falls out of sync with this edit.