Fix Knowledge Graph query-service response unwrapping

[cursor]

Description

Fixes a Knowledge Graph response-shape regression where query-service endpoints that return { data: ... } or { result: ... } envelopes were only unwrapped for HQL run. The same wrapped shape caused queryable type discovery to return an empty list, grammar fetches to leak the envelope instead of returning text, and HQL validation to drop is_valid.

Root cause: hqlRunExtract handled query-service envelopes, but kg_queryable_type_summary, kg_grammar, and HQL validate read only top-level fields.

Fix: add a shared query-service envelope unwrap helper and use it across all Knowledge Graph query-service extractors. Added registry-level regression tests for wrapped discovery, grammar, and validation responses.

Type of Change

• Bug fix
• New feature
• Refactor
• Documentation
• Other

Checklist

• Tests pass
• Typecheck passes

Verification:

• pnpm build
• pnpm docs:generate
• pnpm typecheck
• pnpm test

  

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