Allow audit recipes to bundle multiple related query terms

[Widthdom]

Found while dogfooding the locally built cdidx on branch codex/search-audit-issues-20260619.

Duplicate check: no open issue found for audit recipe multiple query terms bundle recipe.

Evidence:

• Auditing JSON parsing required separate searches for JsonDocument.Parse, JsonNode.Parse, JsonSerializer.Deserialize, and DeserializeAsyncEnumerable.
• Auditing process launch required related searches for ProcessStartInfo, stream redirection, and output capture.
• Auditing filesystem traversal required related searches for multiple Directory.Enumerate* APIs.

Problem:
A recipe currently maps most naturally to one query string. For audit families, it would be more efficient if one recipe could run a bounded set of related query terms and return grouped results.

Acceptance criteria:

• Add recipe metadata for multiple related query terms or subqueries.
• Group output by subquery/API family while preserving existing single-query recipe behavior.
• Add tests for listing, JSON output, and result grouping for a multi-query recipe.

[Widthdom]

Work started on branch fix-issue3787-3714-3731-3710-3694-3693-3670-3696.