fix(renovate): centralize pep621 automerge for Python packages

[JacobPEvans]

Summary

• Adds org-wide automerge rule for pep621-managed Python packages (minor/patch only)
• Merges the existing pep621 schedule rule with automerge fields (3-day stabilization, squash strategy)
• All repos extending this preset with pyproject.toml files now get automated Python dependency updates

Motivation

PR JacobPEvans/nix-ai#370 added per-repo automerge overrides for pep621 packages. This belongs in the
shared preset alongside the existing trust rules for GitHub Actions, Terraform, Nix flakes, and PyPI/HuggingFace.

Immediate beneficiaries

• nix-ai — mlx-server + orchestrator pyproject.toml dependencies
• python-template — pytest, ruff, mypy, bandit dev dependencies

Test plan

• Renovate dashboard shows pep621 automerge enabled for nix-ai and python-template
• Major version updates remain blocked (existing rule)
• Verify 3-day minimumReleaseAge applies

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request standardizes dependency management by migrating per-repository automerge overrides into the shared Renovate preset. By centralizing these rules, the organization ensures consistent automated update behavior for all projects utilizing pep621-managed Python dependencies.

Highlights

• Centralized Automerge Configuration: Enabled automated merging for pep621-managed Python packages at the organization level.
• Update Strategy: Configured minor and patch updates to automatically merge using a squash strategy after a 3-day stabilization period.

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The packages update with grace, In the squash merge they find their place. With three days to wait, To seal up their fate, The code keeps a steady, clean pace.

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[Copilot]

Pull request overview

Centralizes Renovate automerge behavior for Python dependencies managed via pep621 (pyproject.toml) across repos using this shared preset.

Changes:

• Updates the existing pep621 package rule to enable automerge for minor/patch updates only.
• Adds a 3-day stabilization window (minimumReleaseAge) and enforces squash merges for these updates.
• Retains the existing twice-weekly schedule for pep621 updates.

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