Spec configmaps with explicit paths (e.g. "stack-orchestrator/compose/maintenance")
were ignored — only the key name was used to look up under config/.
Now resolves the spec value relative to the stack root when provided.
Values starting with ./ (auto-discovered by deploy init) still use
the existing config/ directory convention.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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