Fernando Lins 3f6378aee7 ci(coverage): fail PR if line coverage regresses (#4876) ...

## Linked issue

Closes #4874

## Summary / motivation

Adds `tools/coverage/check-coverage-regression.py` to compare line
coverage percentages from the current PR against the baseline saved from
main (introduced in #4875). If any stack regresses beyond the
configured tolerance (0.10%), the CI fails with a clear message showing
the delta.

Stacks checked: Rust, python-pylib, python-qt, TypeScript.

## How to test

Try to add some new code without any tests. The Ci must fail.

## Before / after behavior

Before: no signal when a PR reduces coverage below the current main
level.
After: CI fails on `Check coverage regression` with output like:
```
[rust] REGRESSION: 62.64% -> 61.00% (delta: -1.64%, tolerance: 0.10%)
1 stack(s) with coverage regression: rust
```

2026-05-25 13:46:57 -03:00

..

ci.yml

ci(coverage): fail PR if line coverage regresses (#4876)

2026-05-25 13:46:57 -03:00

prepare-release.yml

ci: support releases from non-main branches (#4794)

2026-05-07 14:46:15 -04:00

publish-audio-package.yml

Fix audio package publishing (#4799)

2026-05-11 17:31:56 +03:00

release.yml

feat: Bundle Fcitx plugin (#4886)

2026-05-22 22:33:36 +03:00