rust-data-processing 0.3.0

Schema-first ingestion (CSV, JSON, Parquet, Excel) into an in-memory DataSet, plus Polars-backed pipelines, SQL, profiling, validation, and map/reduce-style processing.
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# Jira visibility (**P3-E1-S5a–S5c**)

Phase 3 expects **[GitHub for Jira](https://support.atlassian.com/jira-cloud-administration/docs/use-the-github-for-jira-app/)** Cloud app:

- Branch / commit / PR titles include **`PROJECT-123`** keys.
- **[Deployments](https://support.atlassian.com/jira-cloud-administration/docs/link-github-workflows-and-deployments-to-jira-work-items)** map **Maven Central** / **Gradle publish** workflows to Jira environments.

**Component:** **`JVM_MavenGradle`** · **Fix Version:** aligned with semantic release tags.

*(Repository automation is instance-specific — no workflow YAML committed here.)*