fix(renovate): extract global defaults, 1-day trusted stabilization

[JacobPEvans]

Summary

• Extract automergeType, automergeStrategy, and minimumReleaseAge to top-level
  defaults — eliminates repetition across 8 rules
• Reduce trusted org stabilization from 3 days to 1 day
• Set global minimumReleaseAge: "3 days" default for untrusted packages
• Group all global config (platformAutomerge, automergeType, automergeStrategy,
  minimumReleaseAge, timezone) at the top of the file

Changes

Setting	Before	After
automergeType / automergeStrategy	Repeated in 8 rules	Top-level default, inherited
Trusted org stabilization	3 days	1 day
Global minimumReleaseAge	(none)	3 days default
Per-rule minimumReleaseAge: "3 days"	Explicit in 4 rules	Removed (inherits global)

Net: -30 lines, +13 lines — DRYer and more maintainable.

Follow-up to #150.

Test plan

• Verify JSON validates (python3 -m json.tool renovate-presets.json)
• Confirm inheriting repos need zero changes
• Verify trusted org PRs use 1-day stabilization
• Verify untrusted packages default to 3-day stabilization

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Refactors the org-wide Renovate preset to reduce repetition by moving shared automerge defaults to the top level, while adjusting stabilization timings (trusted orgs: 1 day; default: 3 days).

Changes:

• Extract automergeType, automergeStrategy, and minimumReleaseAge into top-level defaults and remove per-rule duplicates.
• Reduce trusted-organization minimumReleaseAge from 3 days to 1 day.
• Group global configuration keys together at the top of the preset.

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[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 refactors the Renovate configuration to enhance maintainability and reduce redundancy. It centralizes common automerge and release stabilization settings, applies a shorter stabilization period for trusted dependencies, and sets a global default for untrusted packages, resulting in a cleaner and more efficient configuration.

Highlights

• Configuration Refactoring: Extracted automergeType, automergeStrategy, and minimumReleaseAge to top-level defaults, significantly reducing repetition across eight individual Renovate rules.
• Trusted Package Stabilization: Reduced the stabilization period for trusted organization packages from 3 days to 1 day, allowing for quicker integration of updates from known sources.
• Global Untrusted Package Default: Established a global default minimumReleaseAge of "3 days" for untrusted packages, ensuring a consistent stabilization period for less familiar dependencies.
• Configuration Organization: Consolidated all global Renovate configuration settings, including platformAutomerge, automergeType, automergeStrategy, minimumReleaseAge, and timezone, at the top of the renovate-presets.json file for improved readability and maintainability.

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Config refactored, Defaults now reign, clean and clear, Bots merge with new speed.

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