feat: migrate to Bun-native, fix Planner task dates, remove hardcoded test values

- Remove dotenv dependency, implement lightweight Bun-native env loader
- Replace Node.js fs/path with Bun file APIs (Bun.file, Bun.write)
- Fix Planner task creation to use form's due date with proper UTC handling
- Make table name, Planner assignee configurable via activeConfig and env vars
- Remove all hardcoded test values for PROD readiness
- Update NOTES.md with PROD mode checklist

inspect-tables.ts

@@ -1,8 +1,29 @@
 
-import { config } from 'dotenv';
 import { Client } from '@microsoft/microsoft-graph-client';
 
-config({ path: '/home/admin/secrets/.env' });
+// Bun-native env loader
+async function loadEnv(filePath: string) {
+  const file = Bun.file(filePath);
+  if (!(await file.exists())) {
+    console.warn(`⚠ Env file not found: ${filePath}`);
+    return;
+  }
+  const text = await file.text();
+  for (const line of text.split('\n')) {
+    const trimmed = line.trim();
+    if (!trimmed || trimmed.startsWith('#')) continue;
+    const eqIndex = trimmed.indexOf('=');
+    if (eqIndex === -1) continue;
+    const key = trimmed.slice(0, eqIndex).trim();
+    let value = trimmed.slice(eqIndex + 1).trim();
+    if ((value.startsWith('"') && value.endsWith('"')) || (value.startsWith("'") && value.endsWith("'"))) {
+      value = value.slice(1, -1);
+    }
+    process.env[key] = value;
+  }
+}
+
+await loadEnv('/home/admin/secrets/.env');
 
 async function getGraphToken() {
   const tokenEndpoint = `https://login.microsoftonline.com/${process.env.TENANT_ID}/oauth2/v2.0/token`;