Add lockpickable Personal Filing Cabinet to Derek's office

Expands lockpicking utility by adding optional character depth content:
- Personal journal showing Derek's transformation from hopeful employee to radicalized operative
- Letter from his wife Lisa revealing the personal cost of his choices
- Timeline showing The Architect's recruitment 12 months ago

This lockpick-only content humanizes the antagonist and rewards exploration without being required for mission completion.

scenarios/m01_first_contact/scenario.json.erb

@@ -878,6 +878,42 @@ password_hints = "Common passwords: Marketing123, Campaign2024, Viral_Dynamics_A
           "readable": true,
           "text": "DEREK LAWSON - PERSONAL CALENDAR\n\nToday: Client meeting (cover for this operation)\nTomorrow: Final coordination call with ZDS\nSunday: LAUNCH DAY - Operation Shatter goes live\n\nNote to self: Remember to activate Kevin contingency if audit finds anything. His fingerprints are already on the fake logs.",
           "observations": "Derek's calendar showing Operation Shatter launches Sunday"
+        },
+        {
+          "type": "suitcase",
+          "name": "Personal Filing Cabinet",
+          "takeable": false,
+          "locked": true,
+          "lockType": "key",
+          "keyPins": [50, 30, 60, 40],
+          "difficulty": "medium",
+          "observations": "Secondary filing cabinet - appears to contain personal documents. No key available - would need to pick the lock.",
+          "contents": [
+            {
+              "type": "notes",
+              "name": "Personal Journal - First Entry",
+              "takeable": true,
+              "readable": true,
+              "text": "═══════════════════════════════════════════════════════════\n              DEREK LAWSON - PERSONAL JOURNAL\n                    [FIRST ENTRY - 18 MONTHS AGO]\n═══════════════════════════════════════════════════════════\n\nStarted my new job at Viral Dynamics today. Lisa is so proud.\nShe made dinner to celebrate—her famous lasagna.\n\nThe work seems straightforward. Marketing campaigns,\nclient outreach, the usual. Manager Patricia seems nice.\nKevin in IT helped me set up my workstation.\n\nIt's good to feel normal again. Good to have a fresh start.\n\nI told myself: This time will be different.\nThis time I'll just be... ordinary.\nA marketing manager with a normal life.\n\n[LORE Fragment - Derek's Humanity]",
+              "observations": "Derek's journal from when he started - he seemed genuinely hopeful"
+            },
+            {
+              "type": "notes",
+              "name": "Personal Journal - Turning Point",
+              "takeable": true,
+              "readable": true,
+              "text": "═══════════════════════════════════════════════════════════\n              DEREK LAWSON - PERSONAL JOURNAL\n                    [ENTRY - 12 MONTHS AGO]\n═══════════════════════════════════════════════════════════\n\nI met him today. The Architect.\n\nHe found me. I don't know how.\nHe knew about my background. Things I've never told anyone.\nNot even Lisa.\n\nHe said I was wasting my talents on legitimate marketing.\nThat I was built for something greater.\nThat I could help teach the world a lesson it desperately needs.\n\nHe talked for three hours. About trust. About systems.\nAbout how people have become too comfortable with lies.\n\nBy the end, I understood.\n\nThe ordinary life I wanted—it was never real.\nI was always meant for this.\n\nOperation Shatter begins planning tomorrow.\n\n[LORE Fragment - Radicalization]",
+              "observations": "The moment Derek was recruited by The Architect"
+            },
+            {
+              "type": "notes",
+              "name": "Letter from Lisa (Unsent Reply)",
+              "takeable": true,
+              "readable": true,
+              "text": "Derek,\n\nI found your late-night calendar entries.\nThe encrypted messages on your phone.\nThe way you flinch when I ask about work.\n\nWho are you?\n\nThe man I married wouldn't lie to me for a year.\nThe man I married believed in helping people, not... whatever this is.\n\nI'm staying at my sister's. Don't call.\n\nWhen you're ready to be honest, we'll talk.\nUntil then, I can't look at you.\n\n- Lisa\n\n---\n\n[Derek's draft reply, never sent:]\n\nLisa,\n\nYou wouldn't understand. You still believe the system works.\nYou still think truth matters.\n\nWhat I'm doing will save more lives than it costs.\nThe weak will die. The strong will learn.\n\nYou'll thank me when it's over.\n\n[Note: This letter was never sent. It remains in Derek's drawer.]\n\n[LORE Fragment - Personal Cost]",
+              "observations": "Derek's failing marriage - the personal cost of radicalization"
+            }
+          ]
         }
       ]
     },