fix(config): make platformCommit global-only

[felipecrs]

Changes

This PR changes platformCommit so that it's a global-only option rather than repository-level.

I believe this only makes sense.

/cc @zharinov

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[zharinov]

👍

[jonathanmorley]

We have a use-case for platformCommit in packageRules:

GitHub has a (from what I can find) undocumented limit on the number of files that can be created with the https://docs.github.com/en/rest/git/trees?apiVersion=2026-03-10 endpoint.

Normally, we don't hit that limit, and we can use platformCommit: true.

However, one of our internal packages decided that they wanted to add around 900 files to consuming repositories when the package was updated (using postUpgradeTasks). This hit the limit, and so we used platformCommit: false in a packageRule scoped to that package to allow them to proceed.

While I don't necessarily agree with that package's decisions, this is a configuration workaround that allows them to do it.

[felipecrs]

@jonathanmorley, that's super useful feedback, thank you!

I'm closing this PR as I don't want to cause any regression.