Implement suite-test-name checker

[mmorel-35]

Adds the suite-test-name checker that enforces naming consistency between testify suite structs and their runner functions.

Rule

Runner function must be named Test<SuiteName>:

type BalanceSubscriptionSuite struct { suite.Suite }

// ❌ name doesn't match suite
func TestBalanceSubs_Run(t *testing.T) { suite.Run(t, new(BalanceSubscriptionSuite)) }

// ✅
func TestBalanceSubscriptionSuite(t *testing.T) { suite.Run(t, new(BalanceSubscriptionSuite)) }

Supports both new(SuiteName) and &SuiteName{} instantiation forms. Autofix renames the function identifier.

Enabled by default: false — pure style unification
Autofix: true

Changes

• internal/checkers/suite_test_name.go — AdvancedChecker using inspector.WithStack to find suite.Run calls, extract suite type name, and validate the enclosing function name
• internal/checkers/checkers_registry.go — registered with enabledByDefault: false
• internal/testgen/gen_suite_test_name.go + internal/testgen/main.go — test generator with errored/golden templates
• analyzer/testdata/src/checkers-default/suite-test-name/ — generated test data
• internal/checkers/checkers_registry_test.go, analyzer/checkers_factory_test.go — updated expected checker lists
• README.md — checker documented in table and checkers section
• CONTRIBUTING.md — removed from "Open for contribution"

Closes #48