chore(renovate): replace config with shared preset

[cpritchett]

Renovate onboarding — shared preset

This PR configures Renovate to use the Blavity shared preset.

Previous config status: Already extends shared preset (updating)
Detected stacks: none detected

What this config does

• Extends github>blavity/renovate-config for org-wide defaults (schedules, automerge rules, grouping, merge confidence badges, OSV vulnerability alerts)
• Adds stack-specific packageRules grouping where applicable

What the shared preset provides

• Business-hours schedule (6am–4pm ET weekdays)
• Patch/minor automerge after CI; major requires review
• Security vulnerability alerts (immediate, bypass schedule)
• Merge confidence badges on all PRs
• Lock file maintenance on Saturday mornings
• GitHub Actions digest pinning

Previous config (replaced)

Click to expand

{
  // renovate.json5 — managed by blavity/renovate-config onboarding
  // Extends the org-wide shared preset. Add repo-specific overrides below.
  // Preset docs: https://github.com/blavity/renovate-config
  $schema: "https://docs.renovatebot.com/renovate-schema.json",
  extends: ["github>blavity/renovate-config"]
}

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Opened by onboard.js

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