Add Dependabot config for grouped security updates

[silveltman]

What changed

Adds .github/dependabot.yml with an npm entry that:

• keeps version update PRs off (open-pull-requests-limit: 0), and
• groups every security update into one PR (groups.security.applies-to: security-updates, pattern *).

Why

This repository is the pilot for Dependabot security updates across the organization. The open Astro and sharp alerts (including critical GHSA-26w7-cxv4-gfx2) should arrive as one grouped PR instead of one PR per package, so each PR costs a single Check and CodeRabbit run. After this merges, Dependabot security updates get enabled for this repository, and the resulting PR shows whether Dependabot handles pnpm 12 lockfiles and minimumReleaseAgeStrict.

Verification

• Syntax follows the GitHub docs for Dependabot options and customizing security PRs.
• prettier --check .github/dependabot.yml passes.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Configured weekly checks for npm dependency security updates, with matching security updates grouped together.
  • Automatic pull requests for routine dependency version updates are not enabled. These changes affect dependency maintenance and do not add or change end-user features.

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📝 Walkthrough

Walkthrough

Adds a Dependabot version 2 configuration for npm. It sets weekly checks, disables version-update pull requests, and groups security updates for all packages into one group.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~5 minutes

Change: Other

Merge Risk: 🟡 Moderate · up to 254d5

Security-update PRs may not appear if Dependabot cannot read the lockfile. Confirm compatibility before relying on this pilot.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 254d5

The configuration does not add credentials, execution permissions, or automatic merging. The remaining risk is rollout uncertainty: successful grouped security updates have not yet been demonstrated with this repository’s pnpm version and release-age controls. No introduced security failure is established.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• observed — The declared policy covers security updates across packages in the root npm ecosystem. No cross-repository or cross-environment scope is declared in this file; effective external-service authority remains unverified.

Trust Boundaries and Controls

• observed — Local update policy and external service enforcement are separate control planes. The configuration does not establish repository enablement, effective bot permissions, or acceptance controls for generated dependency PRs.
• observed — The workspace declares strict release-age enforcement, a no-downgrade trust policy, and disabled pnpmfile hooks. Their enforcement during Dependabot processing has not been demonstrated.

Resilience and Maintainability Implications

• inferred — Grouping requests a shared remediation unit across dependencies. Whether a conflicting update delays other security fixes depends on external failure-isolation behavior; no missed or delayed remediation is established by the supplied evidence.

Hardening Proposals

• proposed — Before relying on this pilot for remediation, verify enablement and a successful grouped update with pnpm@12.8.1 and strict release-age controls. Confirm failure visibility and recovery, including independent remediation of urgent alerts if grouping stalls and reconciliation of open PRs after policy rollback.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding a Dependabot configuration for grouped security updates.
Description check	✅ Passed	The description directly explains the Dependabot configuration, its purpose, and the reported verification.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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Actionable comments posted: 1

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🤖 Prompt to fix review comments

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Inline comments:
Review comments at @.github/dependabot.yml:
- Line 5: Update the npm ecosystem configuration in Dependabot so it uses a pnpm
version and lockfile format that Dependabot supports, or verify that the current
pnpm 12 lockfile is recognized before relying on grouped security updates.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 3a082836-fc39-43e6-9296-3c0df4cb87af

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• .github/dependabot.yml

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