feat(cli): stamp global.agent.version from the image tag on helm deploys

[max-parke-scale]

CLI (classic helm) deploys now set global.agent.version to the resolved image tag in the rendered helm values. With agentex-agent chart ≥ 0.6.0 (scaleapi/sgp#5466) that lands as the pod's AGENT_VERSION env var, which the SGP tracing processor (agentex-sdk ≥ 0.25.0, #469) stamps onto every span as __agent_version__ — build provenance on traces, keyed by the same image identity the lineage build/deploy graph uses.

Ordering is free in both directions: old charts ignore the key; the new chart omits the env var when the key is absent. Siblings: chart = scaleapi/sgp#5466; agentex cloud deploy = scaleapi/scaleapi#158940. Set the version via the image tag here or an explicit AGENT_VERSION in manifest env, not both — repeating a chart-generated name renders duplicate env entries.

🧑‍💻🤖 — posted via Claude Code

Greptile Summary

The PR adds the resolved deployment image tag to global.agent.version in generated classic Helm values so compatible charts can expose it as trace provenance.

• Uses the same resolved tag already assigned to global.image.tag.
• Preserves compatibility with charts that ignore the new value.
• Lacks direct deployment-handler coverage for the generated field and its override precedence.

Confidence Score: 4/5

The PR appears safe to merge, with a non-blocking gap in regression coverage for the new Helm-value output.

The generated version uses the same validated image tag as the deployed image, while the only accepted concern is that no deployment-handler test protects this new producer-side contract.

Files Needing Attention: src/agentex/lib/cli/handlers/deploy_handlers.py

Important Files Changed

Filename	Overview
src/agentex/lib/cli/handlers/deploy_handlers.py	Adds the resolved image tag to the Helm agent metadata correctly, but does not add a focused test for the new rendered-values contract.

Prompt To Fix All With AI

### Issue 1
src/agentex/lib/cli/handlers/deploy_handlers.py:284
**Version propagation lacks coverage**

The new `global.agent.version` output has no deployment-handler test asserting that it matches the resolved image tag, including CLI override precedence. A later change to tag resolution or Helm-value merging can therefore silently break trace provenance without a focused test detecting it.

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For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

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