fix(examples): replace removed categories.primary with taxonomy.primary

[Francisco Jiménez (jjcfrancisco)]

The 2026-09-23.0 release removed the categories field from places in favor of taxonomy, so the DuckDB smoke tests started failing on every PR. This swaps categories.primary for taxonomy.primary in the three example queries and the BigQuery snippet.

Tested against live data from 2026-09-23.0.

Closes #541.
Ref #539

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✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Max errors	Warnings	Elapsed time
✅ JAVASCRIPT	eslint	29		0		0	21.41s
✅ MARKDOWN	markdownlint	285		0		0	0.51s
✅ SQL	sqlfluff	79		0		0	6.23s

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Copilot review overview

🟡 Changes recommended

Remaining current-release Snowflake, Athena, and Synapse examples still reference the removed categories field.

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Review effort: Lite
Findings: 1

Open (1)

• Update live examples using removed categories field to taxonomy · New

What changed in this PR

Updates Places examples from removed categories.primary to taxonomy.primary for the 2026-09-23.0 release.

Changes:

• Updated three DuckDB queries.
• Updated the BigQuery example.

File	Description
src/​queries/​duckdb/​seattle_places_for_map.sql	Uses taxonomy.primary.
src/​queries/​duckdb/​places_wawa.sql	Uses taxonomy.primary.
src/​queries/​duckdb/​new_york_pizza.sql	Filters via taxonomy.primary.
docs/​getting-data/​data-mirrors/​bigquery.mdx	Updates the BigQuery example.

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[Alex Iannicelli (atiannicelli)]

Categorically correct