Add The Frontier, a second setting, and a picker to choose between them

Cold Fork is a freight yard: 29 events across two stages, a four-day cycle, and
its own relationship and skill vocabulary. src/engine/ was not touched. Adding it
needed three changes outside the engine: one save slot per pack, app.js holding
the current pack, and turn.js no longer naming the mailroom (DECISIONS #34).
build.js now handles imports wrapped across lines. A conformance suite runs over
every registered pack. DECISIONS #35 records three calls on open questions.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RxdJFbLq1rBKsUeticGV1g

content/corporateladder/index.js

@@ -10,9 +10,17 @@ import { events } from './events/index.js';
 export const corporateLadder = {
   id: 'corporateladder',
   name: 'Corporate Ladder',
+  // One sentence for the setting picker. The interface reads it and knows
+  // nothing else about what this pack is.
+  blurb:
+    'A modern office and a mailroom, two people who have been here longer ' +
+    'than you, and a laminated org chart with your name not on it.',
   version: '0.1.0',
   turnUnit: 'day',
   startingStage: 'mailroom',
+  // What the interface calls the panel of people. The UI used to hardcode
+  // "The mailroom" here, which was the one place it named a setting.
+  peopleHeading: 'The mailroom',
 
   stages: {
     mailroom: { label: 'Mailroom', title: 'Mail Associate I' },
@@ -59,10 +67,11 @@ export const corporateLadder = {
   // rent out every Monday, and only small change in between.
   //
   // Keep this arithmetic honest when tuning: wages, minus two rents, minus
-  // fourteen days of small change. It should come to roughly forty dollars
-  // down over a fortnight — a drift, not a bleed. Rent was once raised without
-  // re-deriving it, which quietly made the baseline four times steeper and
-  // trapped a real playtester below zero for 30% of a 182-turn run.
+  // fourteen days of small change. Per week that is 560 - 455 - 126 = -21, so
+  // about forty dollars down over a fortnight — a drift, not a bleed. Rent was
+  // once raised without re-deriving it, which quietly made the baseline four
+  // times steeper and trapped a real playtester below zero for 30% of a
+  // 182-turn run. The range is asserted from `tuning` below.
   upkeep: [
     { label: 'Coffee, transit, lunch', effects: [{ path: 'money', op: 'add', value: -18 }] },
     // Turn 1 is a Monday, so offset 4 is the first Friday and every 14 makes it
@@ -113,6 +122,18 @@ export const corporateLadder = {
     },
   ],
 
+  // What the conformance suite holds this pack to. The numbers a setting must
+  // hit are the setting's business, so they are declared here rather than
+  // written into a test that names this pack. See DECISIONS.md #31.
+  tuning: {
+    // Net movement of `money` from upkeep alone, per calendar cycle — here a
+    // week — at each stage, with no debt outstanding.
+    baselinePerCycle: {
+      mailroom: [-45, 5],
+      dispatch: [5, 125],
+    },
+  },
+
   // How the interface names and formats this pack's state. The UI reads only
   // this map, so renaming a stat or reordering the header is content's job.
   display: {