refactor(semantics): migrate TIER system to adaptive COMPLEXITY 1-5 scale

- Replaced rigid TIERs with continuous COMPLEXITY 1-5 scale in semantics.md
- Updated generate_semantic_map.py to parse and score based on Complexity
- Added backward compatibility mapping for legacy TIERs
- Migrated all .ai/shots examples to use @COMPLEXITY and updated relation syntax
- Added trivial_utility.py shot to demonstrate implicit Complexity 1 token savings

.ai/shots/trivial_utility.py

@@ -0,0 +1,40 @@
+# [DEF:TrivialUtilityShot:Module]
+# @COMPLEXITY: 1
+# @PURPOSE: Reference implementation of a zero-overhead utility using implicit Complexity 1.
+
+import re
+from datetime import datetime, timezone
+from typing import Optional
+
+# [DEF:slugify:Function]
+# @PURPOSE: Converts a string to a URL-safe slug.
+def slugify(text: str) -> str:
+    if not text:
+        return ""
+    text = text.lower().strip()
+    text = re.sub(r'[^\w\s-]', '', text)
+    return re.sub(r'[-\s]+', '-', text)
+# [/DEF:slugify:Function]
+
+# [DEF:get_utc_now:Function]
+def get_utc_now() -> datetime:
+    """Returns current UTC datetime (purpose is omitted because it's obvious)."""
+    return datetime.now(timezone.utc)
+# [/DEF:get_utc_now:Function]
+
+# [DEF:PaginationDTO:Class]
+class PaginationDTO:
+    # [DEF:__init__:Function]
+    def __init__(self, page: int = 1, size: int = 50):
+        self.page = max(1, page)
+        self.size = min(max(1, size), 1000)
+    # [/DEF:__init__:Function]
+
+    # [DEF:offset:Function]
+    @property
+    def offset(self) -> int:
+        return (self.page - 1) * self.size
+    # [/DEF:offset:Function]
+# [/DEF:PaginationDTO:Class]
+
+# [/DEF:TrivialUtilityShot:Module]