ci: clean up workflow (#3)

## Description

The current CI workflow was auto-generated by Claude, and is really not intuitive. Fixing it up to make it work better.

- Add names for jobs in workflow.
- Rename workflow to `ci.yml`.
- Added `go mod tidy` as a tasks in the `lint` job.

### Decisions

- Chose not to use emojis for workflow or job names. While they look nice, they are unprofessional, and harder to `grep`.

Reviewed-on: #3
Co-authored-by: M.V. Hutz <git@maximhutz.me>
Co-committed-by: M.V. Hutz <git@maximhutz.me>

.gitea/workflows/ci.yml

@@ -7,6 +7,7 @@ on:
 
 jobs:
   lint:
+    name: Golang Lint
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -15,11 +16,15 @@ jobs:
         with:
           go-version-file: go.mod
 
+      - name: Check go mod tidy
+        run: go mod tidy && git diff --exit-code go.mod go.sum
+
       - uses: golangci/golangci-lint-action@v7
         with:
           version: latest
 
   unit-test:
+    name: Unit Tests
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -32,6 +37,7 @@ jobs:
         run: go test ./... -cover -v
 
   fuzz-test:
+    name: Fuzz Tests
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -47,6 +53,7 @@ jobs:
           done
 
   mutation-test:
+    name: Mutation Tests
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4