chore: Fix Renovate PR builds

[liamhughes]

Our Renovate PRs are displaying the following error:

Command failed: npm i -g pnpm@8.15.9 && pnpm install && pnpm build                                                                                                                                                                                                           
npm error code EINVALIDTAGNAME                                                                                                                                                                                                                                               
npm error Invalid tag name "&&" of package "&&": Tags may not have any characters that encodeURIComponent encodes.                                                                                                                                                           
npm error A complete log of this run can be found in: /home/ubuntu/.npm/_logs/2026-03-17T00_18_08_462Z-debug-0.log  

Example: #267 (comment)

The postUpgradeTasks.commands field takes an array of commands.

[Copilot]

Pull request overview

Fixes Renovate PR build failures by aligning postUpgradeTasks.commands with Renovate’s expected format (an array of individual commands rather than a single shell-chained command).

Changes:

• Split the post-upgrade task from one &&-chained command into three discrete commands (npm i -g ..., pnpm install, pnpm build).

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