chore(renovate): use shared wolfstar-project preset

[RedStar071]

Summary

Switches this repo's Renovate config from the external sapphiredev/.github:sapphire-renovate preset to wolfstar-project's own shared preset (github>wolfstar-project/.github:wolfstar-renovate).

• Only the extends array value in .github/renovate.json changed.
• This repo's local override (disabling @types/node updates via npm.packageRules) is left completely unchanged.

Dependencies

This depends on wolfstar-project/.github#45 (adds the wolfstar-renovate.json shared preset) being merged first — otherwise the extends reference here won't resolve and Renovate will fail to parse config for this repo.

Test plan

• Confirm chore(renovate): use shared wolfstar-project preset .github#45 is merged
• Confirm Renovate onboarding/config-validator check passes on this PR
• Confirm a subsequent Renovate run still skips @types/node updates

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Confidence Score: 4/5

Not safe to merge until the shared Renovate preset exists at the referenced location or the configuration points to an existing preset.

Renovate was run against clean before-and-after checkouts, and the changed configuration made a real GitHub request that returned 404 for the requested preset. Inspection of the shared repository confirmed that the requested file is absent.

Files Needing Attention: .github/renovate.json needs its extends reference corrected, or the matching wolfstar-renovate.json preset must be published in wolfstar-project/.github.

T-Rex Logs

What T-Rex did

• T-Rex produced proofs for two posted P1 findings and linked them to the corresponding review comments.
• T-Rex captured and presented the Renovate validation harness and its before/after outputs, including the executable harness and pre- and post-PR 248 Renovate results.
• T-Rex validated the Renovate preset flow with the harness, reviewed the before/after logs and remote repository inspection, and confirmed that the after-capture message about the missing wolfstar-renovate.json is an expected application behavior, not a blocked network or credentials issue.

_{Ran code and verified through T-Rex}

Prompt To Fix All With AI

### Issue 1
.github/renovate.json:3
**Renovate extends a missing WolfStar shared preset**

`github>wolfstar-project/.github:wolfstar-renovate` resolves to `wolfstar-renovate.json` in the shared repository, but that file is not published on its default branch. Renovate receives a 404 for the preset and marks this repository's configuration invalid, so dependency updates will not run. Publish that preset file before switching to it, or retain an existing preset until it is available.

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For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

_{Reviews (1): Last reviewed commit: "chore(renovate): extend shared wolfstar-..." | Re-trigger Greptile}

Greptile also left 1 inline comment on this PR.