chore: rename lint tox env to quality

`quality` is the established standard across the Open edX ecosystem.
Updated tox.ini, Makefile, and CI matrix accordingly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: farhan

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.12"]
-        toxenv: [lint, py]
+        toxenv: [quality, py]
 
     steps:
       - name: Checkout repository

Makefile

@@ -24,7 +24,7 @@ requirements: ## install development environment requirements
 	uv tool install tox --with tox-uv
 
 quality-python: ## Run python linters
-	uv run tox -e lint
+	uv run tox -e quality
 
 quality: quality-python ## Run linters
 

tox.ini

@@ -1,8 +1,8 @@
 [tox]
-envlist = py312, lint
+envlist = py312, quality
 requires = tox-uv>=1
 
-[testenv:lint]
+[testenv:quality]
 runner = uv-venv-lock-runner
 dependency_groups = quality
 commands =