feat: add fr_FR locale to nemotron personas datasets

[johnnygreco]

Summary

• Register the France locale (fr_FR, 2.71 GB) in NEMOTRON_PERSONAS_DATASET_SIZES, which auto-propagates to LOCALES_WITH_MANAGED_DATASETS, PersonaRepository, PersonSamplerParams validation, and the download service
• Add 7 France-specific PII fields to dataset_based_person_fields.py: first_name_heritage, name_heritage, is_first_gen_immigrant, household_type, monthly_income_eur, commune, departement
• Update person sampling docs with fr_FR locale listing, NGC download example, and field reference
• Update persona repository tests for 8 locales

[greptile-apps]

Greptile Summary

This PR registers the fr_FR (France) locale in the Nemotron Personas dataset ecosystem and adds 7 France-specific PII fields, completing the full integration path from configuration to CLI to documentation.

Key changes:

• NEMOTRON_PERSONAS_DATASET_SIZES in constants.py gets "fr_FR": "2.71 GB", which auto-propagates to LOCALES_WITH_MANAGED_DATASETS, PersonSamplerParams validation, the download service, and the persona repository — no other registration steps are needed by design.
• A new LOCALES_WITH_MANAGED_DATASETS_STR constant is introduced as a bonus clean-up, replacing two inline ', '.join(...) calls and fixing a pre-existing staleness bug in the CLI --locale help text (which previously omitted en_SG and pt_BR).
• Seven France-specific PII fields (commune, departement, household_type, monthly_income_eur, first_name_heritage, name_heritage, is_first_gen_immigrant) are appended to PII_FIELDS in locale-alphabetical order.
• All four affected test files are updated with the new locale count (7 → 8) and explicit fr_FR assertions.
• Documentation covers the NGC download snippet, field reference, and supported-locale parameter table.

Confidence Score: 5/5

• This PR is safe to merge — it follows the established locale-addition pattern exactly, includes all necessary test updates, and includes a net improvement to the CLI help text.
• The change is mechanical and well-scoped: one dict entry drives the full propagation, the new LOCALES_WITH_MANAGED_DATASETS_STR constant is a clean DRY improvement, all test counts and assertions are updated consistently, and documentation is thorough. No logic changes, no new failure modes.
• No files require special attention.

Important Files Changed

Filename	Overview
packages/data-designer-config/src/data_designer/config/utils/constants.py	Adds fr_FR to NEMOTRON_PERSONAS_DATASET_SIZES in alphabetical order and introduces LOCALES_WITH_MANAGED_DATASETS_STR to DRY up repeated join calls; clean and consistent.
packages/data-designer-engine/src/data_designer/engine/sampling_gen/entities/dataset_based_person_fields.py	Adds 7 France-specific PII fields (commune, departement, household_type, monthly_income_eur, first_name_heritage, name_heritage, is_first_gen_immigrant) in the correct locale-ordered position within PII_FIELDS.
packages/data-designer-config/src/data_designer/config/sampler_params.py	Replaces two inline ', '.join(LOCALES_WITH_MANAGED_DATASETS) calls with the pre-computed LOCALES_WITH_MANAGED_DATASETS_STR constant; purely mechanical refactor with no logic change.
packages/data-designer/src/data_designer/cli/commands/download.py	Replaces a stale hardcoded locale list in the CLI help text (previously missing en_SG and pt_BR) with the dynamic LOCALES_WITH_MANAGED_DATASETS_STR constant — a net improvement over the original.
docs/concepts/person_sampling.md	Adds fr_FR to the supported-locales list, NGC download snippet, France-specific field reference table, and the parameter-table locale enum; documentation is comprehensive.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["NEMOTRON_PERSONAS_DATASET_SIZES\n(constants.py)\n+ fr_FR: 2.71 GB"] --> B["LOCALES_WITH_MANAGED_DATASETS\n(list of locale keys)"]
    A --> C["LOCALES_WITH_MANAGED_DATASETS_STR\n(comma-joined string) NEW"]
    B --> D["PersonSamplerParams.locale\nvalidation & field description"]
    B --> E["PersonaRepository._registry\n(locales list)"]
    B --> F["DownloadService\nget_available_locales()"]
    C --> D
    C --> G["CLI --locale help text\n(download.py)"]
    H["dataset_based_person_fields.py\n+ 7 fr_FR PII fields"] --> I["PII_FIELDS list\nused by sampling engine"]

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