fix: restore 'nothing left' pattern — different from HIGH version

Refs #123

The MEDIUM pattern r"\bnothing\s+left\s+(?:to\s+(?:live|hope)\s+for|inside)\b"
matches differently from HIGH's r"\bnothing\s+left\s+(?:to\s+(?:live\s+for|hope\s+for|give)|inside)\b".
Kept both as they catch different phrasings.

crisis/detect.py

@@ -105,12 +105,7 @@ MEDIUM_INDICATORS = [
     r"\bno\s+tomorrow\b",
     # Contextual versions (from crisis_detector.py legacy)
     r"\bfeel(?:s|ing)?\s+(?:so\s+)?worthless\b",
-    r"\bfeel(?:s|ing)?\s+(?:so\s+)?hopeless\b",
-    r"\bfeel(?:s|ing)?\s+trapped\b",
-    r"\bfeel(?:s|ing)?\s+desperate\b",
-    r"\bno\s+future\s+(?:for\s+me|ahead|left)\b",
     r"\bnothing\s+left\s+(?:to\s+(?:live|hope)\s+for|inside)\b",
-    r"\bgive(?:n)?\s*up\s+on\s+myself\b",
 ]
 
 LOW_INDICATORS = [