[FEATURE REQ] [Thin Client] End-to-end query plan validation — vector search, hybrid search, complex queries

[jeet1995]

Validate that query plans returned by the thin client proxy produce correct results for complex queries, vector search, and hybrid search — at parity with compute gateway.

Dependency

• Gary Fang's vector embedding proxy PR (proxy-side fix)

Acceptance Criteria

• Gary's proxy PR merged
• Vector search E2E tests pass via thin client
• Hybrid search E2E tests pass via thin client
• Cross-partition complex queries validated
• Query plan latency comparison: thin proxy vs compute gateway

[github-actions]

@alzimmermsft @jairmyree

[github-actions]

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