Add types and validation (#3)

src/linter.ts

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+// Plan linter
+import { parse } from "./parser";
+
+export function lint(plan: string) {
+  const lines = parse(plan);
+  const warnings: string[] = [];
+  for (const line of lines) {
+    if (line.includes("ASAP")) warnings.push("Ambiguous urgency: ASAP");
+  }
+  return warnings;
+}

src/parser.ts

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+// Directive parser v2
+export function parse(raw: string): string[] {
+  return raw.split("\n").map(l => l.trim()).filter(Boolean);
+}
+
+export function parseTimestamp(line: string): Date | null {
+  const match = line.match(/\d{4}-\d{2}-\d{2}/);
+  return match ? new Date(match[0]) : null;
+}

src/types.ts

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+export interface Directive {
+  text: string;
+  timestamp?: Date;
+  source: string;
+}

src/validate.ts

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+import type { Directive } from "./types";
+
+export function validate(d: Directive): boolean {
+  return d.text.length > 0 && d.source.length > 0;
+}