🧪Integrate jsonschema into pre-commit framework

[webknjaz]

This plugs built-in checks for GitHub Actions and Workflows, and also enforces timeouts on each job definition. The patch skips checking the RTD config as the schema demands the build.tools mapping to be non- empty which conflicts with what we've got as we provision Python via uv ourselves.

Contributor checklist

• Included tests for the changes.
• A change note is created in changelog.d/ (see changelog.d/README.md for instructions) or the PR text says "no changelog needed".

Maintainer checklist

• If no changelog is needed, apply the bot:chronographer:skip label.
• Assign the PR to an existing or new milestone for the target version (following Semantic Versioning).

[Copilot]

Pull Request Overview

This PR integrates jsonschema validation into the pre-commit framework to enforce best practices for GitHub Actions workflows, specifically ensuring all jobs define timeout limits.

• Adds check-jsonschema pre-commit hooks for validating GitHub Actions and workflow files
• Enforces timeout-minutes requirement on all workflow job definitions
• Adds timeout values to all workflow jobs (2-9 minutes depending on job complexity)

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
.pre-commit-config.yaml	Adds check-jsonschema hooks for GitHub Actions/workflows validation and timeout enforcement; comments out check-readthedocs due to schema conflict
.github/workflows/reusable-qa.yml	Adds 2-minute timeout to the QA job with explanatory comment
.github/workflows/ci.yml	Adds timeouts to test (7 min), pypy (9 min), coverage-summary (1 min), and check (1 min) jobs

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[sirosen]

I've been uncertain about whether or not that require-timeouts schema really belongs in check-jsonschema -- I added it pretty early in the project and haven't felt sure about it. So I'm glad to see it here, it's signal that it's really useful, and not just to me!

I've started looking into the readthedocs schema issue a little, but I'll probably need to file an issue over there and ask some questions.

Anyway, none of that blocks this update!

[webknjaz]

Yep, I actually integrate it everywhere.