feat: plugin contract e2e, qualify --changed, production observe, regressions

src/domain/contract-validation.ts

@@ -179,11 +179,13 @@ const makeConditionFailure = (
   const expected = fieldExpectation?.expected ?? statusExpectation.expected
   const actual = fieldExpectation?.actual ?? statusExpectation.actual
   const diff = buildDiff(formula, ctx.response.body)
+  const source = (route as RouteContract | undefined)?.formulaSources?.[formula]
 
   return makeViolation({
     route: route ?? { method: '', path: '' },
     formula,
     kind,
+    ...(source ? { source, phase: 'postcondition' } : {}),
     request: {
       body: ctx.request.body,
       headers: ctx.request.headers,
@@ -206,10 +208,12 @@ const makeFormulaError = (
   route: RouteContract | { method: string; path: string } | undefined,
   message: string
 ): ContractViolation => {
+  const source = (route as RouteContract | undefined)?.formulaSources?.[formula]
   return makeViolation({
     route: route ?? { method: '', path: '' },
     formula,
     kind,
+    ...(source ? { source, phase: 'postcondition' } : {}),
     request: {
       body: ctx.request.body,
       headers: ctx.request.headers,