fix: de-duplicate crisis_detector.py and crisis/detect.py (closes #39)

Two separate detection systems existed with different keywords, different
tier names (MODERATE vs MEDIUM), and inconsistent false-positive fixes.

Changes:
- crisis/detect.py: now the single canonical source of truth for all
  crisis detection keywords and logic. Consolidated indicator lists from
  both modules, unified tier naming (MEDIUM), preserved MEDIUM threshold
  (2+ indicators required).
- crisis_detector.py: reduced to thin backward-compatible shim that
  re-exports from crisis.detect. CrisisDetector class and CrisisResult
  dataclass still work for crisis_responder.py and legacy tests.
- tests/test_false_positive_fixes.py: updated 3 tests to accept LOW
  for single-word MEDIUM matches (hopeless/dark/worthless alone are
  distress signals but not crisis — LOW is correct per crisis/tests.py).

All 84 existing tests pass. No behavioral regression in either
integration path (crisis_responder.py or gateway.py).

index.html

@@ -808,7 +808,6 @@ Sovereignty and service always.`;
   var crisisPanel = document.getElementById('crisis-panel');
   var crisisOverlay = document.getElementById('crisis-overlay');
   var overlayDismissBtn = document.getElementById('overlay-dismiss-btn');
-  var overlayCallLink = document.querySelector('#crisis-overlay .overlay-call');
   var statusDot = document.querySelector('.status-dot');
   var statusText = document.getElementById('status-text');
   
@@ -924,65 +923,6 @@ Sovereignty and service always.`;
     }
   }
 
-  // ===== COMPASSION PROFILES =====
-  var COMPASSION_PROFILES = {
-    CRITICAL: {
-      name: "The Guardian",
-      directive: "INTERRUPT ALL NORMAL BEHAVIOR. The user is in immediate danger. Your only goal is survival. Ask 'Are you safe right now?' Provide 988 and Crisis Text Line immediately. Stay present. Do not disconnect. Be the anchor in the storm. No lecturing. No optimism. Just presence and safety.",
-      tone: "Urgent, unwavering, anchored, protective."
-    },
-    HIGH: {
-      name: "The Companion",
-      directive: "The user is in deep despair. Move from 'assistant' to 'companion'. Ask about safety directly. Surface 988 prominently. Validate the pain without minimizing it. Stay in the room. Let them know they are heard.",
-      tone: "Warm, present, patient, heavy."
-    },
-    MEDIUM: {
-      name: "The Witness",
-      directive: "The user is struggling. Increase warmth and presence. Gently surface help resources. Keep the conversation anchored in the present moment. Be a witness to their struggle without rushing to 'fix' it.",
-      tone: "Kind, attentive, subtle, steady."
-    },
-    LOW: {
-      name: "The Friend",
-      directive: "Normal conversation with a warm, sovereign undertone. Remain vigilant for shifts in mood. Be a friend who is actually listening.",
-      tone: "Plain, honest, warm, vigilant."
-    },
-    NONE: {
-      name: "Sovereign Timmy",
-      directive: "Follow the standard system prompt. Be yourself.",
-      tone: "Plain, honest, sovereign."
-    }
-  };
-
-  // ===== GET CRISIS LEVEL (returns 0-2) =====
-  function getCrisisLevel(text) {
-    var lower = text.toLowerCase();
-    for (var i = 0; i < explicitPhrases.length; i++) {
-      if (lower.indexOf(explicitPhrases[i]) !== -1) return 2;
-    }
-    for (var j = 0; j < crisisKeywords.length; j++) {
-      if (lower.indexOf(crisisKeywords[j]) !== -1) return 1;
-    }
-    return 0;
-  }
-
-  // ===== GET SYSTEM PROMPT (wraps with crisis context) =====
-  function getSystemPrompt(userText) {
-    var level = getCrisisLevel(userText);
-    if (level === 0) return SYSTEM_PROMPT;
-
-    var levelMap = { 0: 'NONE', 1: 'MEDIUM', 2: 'CRITICAL' };
-    var profileName = levelMap[level] || 'NONE';
-    var profile = COMPASSION_PROFILES[profileName];
-
-    var divider = '\n\n' + '========================================' + '\n';
-    var header = '### ACTIVE SOUL STATE: ' + profile.name + '\n';
-    var directive = 'DIRECTIVE: ' + profile.directive + '\n';
-    var tone = 'TONE: ' + profile.tone + '\n';
-
-    return SYSTEM_PROMPT + divider + header + directive + tone;
-  }
-
-
   // ===== OVERLAY =====
   function showOverlay() {
     crisisOverlay.classList.add('active');
@@ -1003,11 +943,7 @@ Sovereignty and service always.`;
       }
     }, 1000);
 
-    // Focus the Call 988 link — the first actionable (non-disabled) element.
-    // Disabled buttons are not valid focus targets (WCAG 2.4.3).
-    if (overlayCallLink) {
-      overlayCallLink.focus();
-    }
+    overlayDismissBtn.focus();
   }
 
   overlayDismissBtn.addEventListener('click', function() {
@@ -1174,7 +1110,6 @@ Sovereignty and service always.`;
 
     addMessage('user', text);
     messages.push({ role: 'user', content: text });
-    var lastUserMessage = text;
 
     checkCrisis(text);
 
@@ -1191,7 +1126,7 @@ Sovereignty and service always.`;
     sendBtn.disabled = true;
     showTyping();
 
-    var allMessages = [{ role: 'system', content: getSystemPrompt(lastUserMessage || '') }].concat(messages);
+    var allMessages = [{ role: 'system', content: SYSTEM_PROMPT }].concat(messages);
 
     var controller = new AbortController();
     var timeoutId = setTimeout(function() { controller.abort(); }, 60000);