fix(cli): make agent autoscaling opt-in instead of a hardcoded default

[mohammadatallah-scale]

Important

Pending Mohammad's self-review. This note is removed by a human, not automation.

This CLI gave every deployment an HPA, so a crash-looping pod's restart CPU burn read as load, scaled it to maxReplicas, and froze there. Four of its releases account for 39 of 49 crash-looping pods on dev-sgp.

• The fix Autoscaling defaults off, block kept so an environments.yaml opt-in still inherits the bounds.
• Behaviour change Deployments relying on the old default are capped at 1 replica until they opt in.
• Also needs it Draft refactor(config): promote helm-values generation to agentex.config.helm_values #402 relocates this block verbatim.

scaleapi/scaleapi#157885 fixes the same default on the backend cloud-deploy path. This PR is the CLI path.

cc @danielmillerp @RoxyFarhad @smoreinis @MichaelSun48 @declan-scale, this repo has no CODEOWNERS so the PR needs routing.

Test plan

• Default-off assertions for the agent and the worker go red when the old default is restored
• All 5 committed environments.yaml consumers checked: none sets autoscaling, so none relies on an absent enabled key
• CI not yet green

Greptile Summary

The PR makes CLI-generated agent and Temporal worker autoscaling opt-in while retaining default replica and CPU bounds for explicit opt-ins.

• Changes both generated Helm autoscaling blocks to default enabled to false.
• Documents the opt-in configuration across all generated environment templates.
• Adds deployment-merge tests covering defaults, separate worker opt-in, inherited bounds, and environment overrides.

Confidence Score: 5/5

The PR appears safe to merge, with the implementation, generated configuration guidance, and tests aligned on autoscaling being disabled unless explicitly enabled.

The recursive Helm-value merge preserves default bounds for partial opt-ins, the agent and Temporal worker remain independently configurable, and no concrete changed-code failure remains.

Important Files Changed

Filename	Overview
src/agentex/lib/cli/handlers/deploy_handlers.py	Disables agent and Temporal worker autoscaling by default while preserving recursively merged bounds and environment overrides.
tests/lib/cli/test_deploy_handlers.py	Adds focused coverage for disabled defaults, inherited autoscaling bounds, independent Temporal worker configuration, and override precedence.
src/agentex/lib/cli/templates/default/environments.yaml.j2	Documents the agent autoscaling opt-in beneath the generated environment's Helm overrides.
src/agentex/lib/cli/templates/temporal/environments.yaml.j2	Documents separate agent and Temporal worker autoscaling opt-ins using the canonical Helm value paths.

_{Reviews (1): Last reviewed commit: "fix(cli): make agent autoscaling opt-in ..." | Re-trigger Greptile}

Context used:

• Knowledge Base — AgentEx CLI project-to-runtime flow