[docs] Update Repo Mind Light AW documentation for 2026-06-08

[szabta89]

Summary

• Added soma: null to the config schema YAML example under query, showing it as an alternative embedding-free retrieval backend.
• Added a schema note clarifying that query.graph_rag_zero and query.soma are mutually exclusive. graph_rag_zero is embedding-based and enabled by default; soma is an embedding-free graph-structural backend available in the default public image. Consumers switching to Soma should set query.graph_rag_zero: null and configure query.soma: {}.

Source Context

• Checked repo-mind-light-source/repo_mind_light/config.py: the QuerySourcesConfig model has a soma: SomaConfig | None = None field and a validator that rejects configs with both graph_rag_zero and soma set.
• Checked repo-mind-light-source/README.md: documents soma prominently as an alternative backend and shows soma: null in the config reference.
• Checked repo-mind-light-source/DOCKER.md: includes a full "Retrieval Backends" section explaining both backends and that INCLUDE_SOMA=1 is the default build arg, meaning the public image ships with Soma support.
• Checked repo-mind-light-source/CHANGELOG.md: soma-related changes appear in v0.10.0 and v0.10.1 (the current source release), confirming this is a shipped feature.

Validation

• Config schema YAML example updated to show soma: null alongside code_search, consistent with the structure in the source README.
• Schema note is accurate: graph_rag_zero and soma being mutually exclusive is enforced by a model_validator in QuerySourcesConfig.
• No private implementation details, internal issue references, or roadmap items included.

Notes

• No changes were made to .github/workflows/shared/repo-mind-light.md; the recommended config snippet there covers the common case (GRZ default) and the soma note belongs in the reference docs rather than the shared workflow comments.
• SomaConfig fields (corpus_subdir, max_tokens, assembly, etc.) are not documented here since they are advanced knobs not needed for a basic Soma setup (soma: {} is sufficient to enable it).

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• expires on Jun 15, 2026, 10:56 AM UTC