Upgrade Next.js to 15.5.9

[Copilot]

Upgrades Next.js from 15.5.7 to 15.5.9.

Changes

• next: ^15.5.7 → ^15.5.9
• eslint-config-next: ^15.1.2 → ^15.5.9 (aligned with Next.js version)
• Updated package-lock.json with resolved dependency versions

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• fonts.googleapis.com
  • Triggering command: /usr/local/bin/node /usr/local/bin/node /home/REDACTED/work/code-graph/code-graph/node_modules/next/dist/compiled/jest-worker/processChild.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Upgrade to nextjs 15.5.9</issue_title>
<issue_description>

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Comments on the Issue (you are @copilot in this section)

• Fixes Upgrade to nextjs 15.5.9 #503

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Project	Deployment	Review	Updated (UTC)
code-graph	Ready	Preview, Comment	Dec 21, 2025 7:58am

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