Raise the supported Python floor to 3.7.4

[njzjz-bot]

Summary

• set requires-python to the first Python release supported by typeguard 4
• keep the existing Python 3.7 classifier and CI coverage
• ensure built wheel metadata carries the corrected floor

Fixes #122.

Validation

• Built wheel with --no-isolation
• Verified wheel METADATA contains Requires-Python: >=3.7.4

AI attribution

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 6d71974f-3d02-42d7-b629-0b04c6fe4937

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[njzjz-bot]

Review result: no blocking issues found.

Raising Requires-Python to >=3.7.4 aligns the advertised floor with resolvable typeguard>=4 releases. I built the wheel and confirmed its metadata reports Requires-Python: >=3.7.4; CI is green.

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh