#532 Document the full check-local test set in contributor notes

[Fredrick Meunier]

🤖 This is an automated response from Repo Assist.

Problem

hacking/unittests.txt lists only a subset of tests run by make check and omits current input, widget, audio and automation targets, so contributors cannot discover them.

Proposed change

Add a concise list of the additional check-local test targets with their conditional build guards and current single-test examples.

Notes

• Documentation only; no behavioural change.
• Headless null-UI build and make check passed; interactive runtime not_run.

Validation

• Fuse null-ui profile: autogen, configure, build and make check passed; interactive runtime not_run. (passed)

Changed files

• hacking/unittests.txt

Repo-Assist-Effect: 0c38d08f93ef0c72c42e41f32936390a53bb6a4bf7aed4712cdad76976bf2ff6

[Fredrick Meunier]

Applied in [040a36].