AI automated code review (Gemini 3).

Overall risk: low

Summary:
This pull request enhances the C2D engine's resource management by allowing CPU and RAM resource configurations (total, max, min) to be overridden via envConfig.resources. Previously, only non-CPU/RAM resources could be added or configured this way. The changes enable more granular control over compute resources per environment, aligning with the intent to allow custom overrides for core resources.

Comments:
• [INFO][other] The logic else if (res.total != null) existing.max = res.total effectively sets existing.max to existing.total if res.max is not explicitly provided but res.total is. This ensures max is always updated to at least total when total is present. This seems to be a deliberate design choice to infer max from total.
• [INFO][other] If res.id is 'cpu' or 'ram' but existing is undefined (i.e., 'cpu' or 'ram' is not found in this.envs[0].resources), the current logic silently skips the update. This is likely acceptable given that CPU and RAM are expected to be default resources always present. However, if there's a scenario where they might not be, this would prevent configuration. Consider if an else branch to add the resource if existing is not found, or a warning/error, would be beneficial, though probably not required for the current design.