Add draft routine defaults and run-time overrides

packages/shared/src/routine-variables.test.ts

@@ -1,7 +1,10 @@
 import { describe, expect, it } from "vitest";
 import {
+  BUILTIN_ROUTINE_VARIABLE_NAMES,
   extractRoutineVariableNames,
+  getBuiltinRoutineVariableValues,
   interpolateRoutineTemplate,
+  isBuiltinRoutineVariable,
   syncRoutineVariablesWithTemplate,
 } from "./routine-variables.js";
 
@@ -40,4 +43,34 @@ describe("routine variable helpers", () => {
       }),
     ).toBe("Review paperclip for high");
   });
+
+  it("identifies built-in variable names", () => {
+    expect(isBuiltinRoutineVariable("date")).toBe(true);
+    expect(isBuiltinRoutineVariable("repo")).toBe(false);
+    expect(BUILTIN_ROUTINE_VARIABLE_NAMES.has("date")).toBe(true);
+  });
+
+  it("getBuiltinRoutineVariableValues returns date in YYYY-MM-DD format", () => {
+    const values = getBuiltinRoutineVariableValues();
+    expect(values.date).toMatch(/^\d{4}-\d{2}-\d{2}$/);
+    expect(values.date).toBe(new Date().toISOString().slice(0, 10));
+  });
+
+  it("excludes built-in variables from syncRoutineVariablesWithTemplate", () => {
+    const result = syncRoutineVariablesWithTemplate(
+      "Daily report for {{date}} — {{repo}}",
+      [],
+    );
+    expect(result).toEqual([
+      { name: "repo", label: null, type: "text", defaultValue: null, required: true, options: [] },
+    ]);
+  });
+
+  it("interpolates built-in date variable alongside user variables", () => {
+    const builtins = getBuiltinRoutineVariableValues();
+    const allVars = { ...builtins, repo: "paperclip" };
+    expect(
+      interpolateRoutineTemplate("Report for {{date}} on {{repo}}", allVars),
+    ).toBe(`Report for ${builtins.date} on paperclip`);
+  });
 });