docs(datasets): document schema_inference depth field

[claudespice]

Summary

spiceai/spiceai#11284 adds the dataset-level schema_inference field, which controls how deeply the runtime infers source-schema metadata. It was undocumented (only referenced indirectly from the Cayenne accelerator page, which requires schema_inference: extended for adaptive auto-tuning). This adds a reference section in the dataset spec.

Documents both values verified against source:

• standard (default) — SchemaInference::Standard, base column/type inference only
• extended — additionally auto-detects primary key, secondary indexes, and sort/clustering columns

Verified against crates/spicepod/src/component/dataset.rs (top-level dataset field, #[serde(rename_all = "snake_case")], default Standard). The field's own doc-comment confirms only the PostgreSQL and MongoDB connectors emit this metadata; other connectors treat extended as a no-op, and it applies to all refresh modes.

Addition → vNext only (website/docs/).

Source PRs

• feat: deepen extended schema inference and wire it into cayenne compaction sharding/sorting spiceai#11284 — feat: deepen extended schema inference and wire it into cayenne compaction sharding/sorting

Test plan

• cd website && npm run build passes
• Versioned-docs propagation: addition, vNext only — no versioned copies
• Files updated: 1 (website/docs/reference/spicepod/datasets.md)

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