chore(agentic-ci): add future annotations import to dataset_metadata.py

[github-actions]

Summary

Add from __future__ import annotations to
packages/data-designer-config/src/data_designer/config/dataset_metadata.py.

Why

Per AGENTS.md ("Structural Invariants"):

from __future__ import annotations — required in every Python source file.

The structural-integrity audit detected this file as the only source file
under packages/*/src/ missing the import.

What changed

A single line — from __future__ import annotations — inserted after the
SPDX header block and before existing imports. No functional change.

Tests

make test-config — 562 passed.

Provenance

Generated by the agentic-ci structure suite (daily run, 2026-05-13).
Finding id dc0ea67d384e, fix confidence 1.0.

[greptile-apps]

Greptile Summary

This PR adds the missing from __future__ import annotations import to dataset_metadata.py, the only file under packages/*/src/ that was lacking it, bringing it in line with the repository's structural invariant.

• Single-line insertion after the SPDX header block; all annotations in this file (list[str]) remain valid under deferred evaluation with both Pydantic v1 and v2.
• Automated structural-integrity audit (agentic-ci structure suite) detected and generated this fix; 562 tests passed.

Confidence Score: 5/5

Safe to merge — a single-line import addition with no functional change and a full passing test suite.

The change adds exactly one import line to satisfy a repo-wide structural rule. The existing annotation (list[str]) is compatible with deferred evaluation, and the test run confirms no regressions.

No files require special attention.

Important Files Changed

Filename	Overview
packages/data-designer-config/src/data_designer/config/dataset_metadata.py	Adds from __future__ import annotations after the SPDX header block to comply with the repo-wide structural invariant; no functional change.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["dataset_metadata.py"] --> B["SPDX Header Comments"]
    B --> C["from __future__ import annotations ✅ (added)"]
    C --> D["from pydantic import BaseModel"]
    D --> E["class DatasetMetadata(BaseModel)"]
    E --> F["seed_column_names: list[str] = []"]

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_{Reviews (3): Last reviewed commit: "Merge branch 'main' into agentic-ci/chor..." | Re-trigger Greptile}

[eric-tramel]

Incredible find agentic-ci 🫡

[github-actions]

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[andreatgretel]

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