chore: unify name to "Meeting Mixer", README tech stack, name magic numbers (#16)

- Canonical name "Meeting Mixer" everywhere: <title>, README, .vch-description
  (now non-technical per convention) and package.json (meeting-mixer).
- README gains a Tech-Stack section and an accurate, non-misleading port note.
- Magic numbers replaced by named constants: LOW_PRIORITY_PENALTY in
  algorithm.js; MIN/MAX_MODERATORS_PER_DAY in utils.js, used by data.js,
  calendar.js and app.js.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

js/algorithm.js

@@ -1,5 +1,8 @@
 import { toISO, getWeekday } from './utils.js';
 
+// Score penalty applied when a candidate is low-priority on the given weekday.
+const LOW_PRIORITY_PENALTY = 5;
+
 function isOnVacation(employee, isoDate) {
   return employee.constraints.vacations.some(v => v.from <= isoDate && isoDate <= v.to);
 }
@@ -60,7 +63,7 @@ function scoreCandidate(employee, isoDate, histCount, randomFn) {
   let score = -myTotal;
 
   // Low priority: increase negative score (less likely to be picked)
-  if (employee.constraints.lowPriorityDays.includes(wd)) score -= 5;
+  if (employee.constraints.lowPriorityDays.includes(wd)) score -= LOW_PRIORITY_PENALTY;
 
   // Jitter ±0.49
   score += (randomFn() - 0.5) * 0.98;

js/app.js

@@ -2,6 +2,7 @@ import { renderEmployees } from './employees.js';
 import { renderCalendar } from './calendar.js';
 import { renderDataTab } from './history.js';
 import { normalizeEmployees } from './data.js';
+import { MIN_MODERATORS_PER_DAY, MAX_MODERATORS_PER_DAY } from './utils.js';
 
 const STORAGE_KEY = 'morning-planner-state';
 
@@ -22,7 +23,8 @@ try {
     if (parsed.calendar) state.calendar = parsed.calendar;
     if (Array.isArray(parsed.history)) state.history = parsed.history;
     if (parsed.settings && Number.isInteger(parsed.settings.moderatorsPerDay)
-        && parsed.settings.moderatorsPerDay >= 1 && parsed.settings.moderatorsPerDay <= 5) {
+        && parsed.settings.moderatorsPerDay >= MIN_MODERATORS_PER_DAY
+        && parsed.settings.moderatorsPerDay <= MAX_MODERATORS_PER_DAY) {
       state.settings = { moderatorsPerDay: parsed.settings.moderatorsPerDay };
     }
   }

js/calendar.js

@@ -2,7 +2,8 @@ import { state, saveState } from './app.js';
 import { getWorkdays, generatePlan } from './algorithm.js';
 import { toggleHoliday, toggleClosure, addHistoryEntries, removeHistoryEntry } from './data.js';
 import { exportSchedule, downloadBlob } from './excel.js';
-import { toISO, monthPrefix, getWeekday, buildNameMap } from './utils.js';
+import { toISO, monthPrefix, getWeekday, buildNameMap,
+  MIN_MODERATORS_PER_DAY, MAX_MODERATORS_PER_DAY } from './utils.js';
 
 const MONTHS = ['Januar','Februar','März','April','Mai','Juni',
   'Juli','August','September','Oktober','November','Dezember'];
@@ -61,7 +62,7 @@ export function renderCalendar() {
 
   const slotsSel = document.createElement('select');
   slotsSel.id = 'cal-slots';
-  for (let n = 1; n <= 5; n++) {
+  for (let n = MIN_MODERATORS_PER_DAY; n <= MAX_MODERATORS_PER_DAY; n++) {
     const opt = document.createElement('option');
     opt.value = String(n);
     opt.textContent = String(n);

js/data.js

@@ -1,3 +1,5 @@
+import { MIN_MODERATORS_PER_DAY, MAX_MODERATORS_PER_DAY } from './utils.js';
+
 function generateId() {
   if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
     return crypto.randomUUID();
@@ -17,8 +19,8 @@ function generateId() {
 
 function parseSettings(raw) {
   const n = raw?.moderatorsPerDay;
-  const valid = Number.isInteger(n) && n >= 1 && n <= 5;
-  return { moderatorsPerDay: valid ? n : 1 };
+  const valid = Number.isInteger(n) && n >= MIN_MODERATORS_PER_DAY && n <= MAX_MODERATORS_PER_DAY;
+  return { moderatorsPerDay: valid ? n : MIN_MODERATORS_PER_DAY };
 }
 
 function defaultConstraints() {

js/utils.js

@@ -1,4 +1,9 @@
-// Shared pure helpers used across modules.
+// Shared pure helpers and constants used across modules.
+
+// Allowed range for the "moderators per day" setting.
+export const MIN_MODERATORS_PER_DAY = 1;
+export const MAX_MODERATORS_PER_DAY = 5;
+
 
 // "YYYY-MM-DD" from numeric parts.
 export function toISO(year, month, day) {