Add exercise version hash

[reppuli92]

Description

What?

Add a hashcode to store exercise version numbers

Why?

This is done to support questionnaire reset if the has differs to refresh updated questionnaires (the reset is on a separate PR on a-plus)

How?

The hash is computed whenever an exercise is edited.

Part of apluslms/a-plus#494

Testing

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• How to test your changes in A-plus
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What type of test did you run?

• Accessibility test using the WAVE extension.
• Django unit tests.
• Playwright tests.
• Other test. (Add a description below)
• Manual testing.

I tested the actual reset functionality, which works. I did not test the hashes specifically

Did you test the changes in

• Chrome
• Firefox
• This pull request cannot be tested in the browser.

Think of what is affected by these changes and could become broken

Translation

• Did you modify or add new strings in the user interface? (Read about how to create translation)

Programming style

• Did you follow our style guides?
• Did you use Python type hinting in all functions that you added or edited? (type hints for function parameters and return values)

Have you updated the README or other relevant documentation?

• documents inside the doc directory.
• README.md.
• Aplus Manual.
• Other documentation (mention below which documentation).

Is it Done?

• Reviewer has finished the code review
• After the review, the developer has made changes accordingly
• Customer/Teacher has accepted the implementation of the feature

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[Copilot]

Pull request overview

Adds an exercise “version” hash to the exercise configuration and exposes it to the frontend so downstream systems (A-plus) can detect exercise edits and trigger questionnaire resets when the version changes.

Changes:

• Compute and store a SHA-256 hash (content_hash) for each exercise when loading/parsing exercise configs.
• Expose the hash to clients via a new <meta name="x-aplus-exercise-version" ...> tag in the exercise head template.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
access/config.py	Computes and attaches content_hash to exercise configuration data during exercise load.
access/templates/access/exercise_head.html	Adds a meta tag exposing the computed hash to the client when available.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

[ihalaij1]

Great!

I tested this a bunch, found and fixed some bugs with the help of AI, but I would still want @murhum1 to go through this PR to increase the confidence that this doesn't cause any issues.