core: Registry, Skills, Router, Executor, Verifier, Runner mit Tests

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

core/src/knaster/budget.py

@@ -0,0 +1,36 @@
+"""Token-Budget: Passt Prompt + Ausgabe in den effektiven Kontext eines Slots?"""
+
+from __future__ import annotations
+
+import math
+from collections.abc import Callable
+from dataclasses import dataclass
+
+MESSAGE_OVERHEAD = 64
+
+Tokenizer = Callable[[str], int]
+
+
+def estimate_tokens(text: str) -> int:
+    """Konservative Schätzung (eher zu hoch): ~3 Zeichen pro Token."""
+    return math.ceil(len(text) / 3)
+
+
+@dataclass(frozen=True)
+class Budget:
+    prompt_tokens: int
+    output_tokens: int
+    limit: int
+
+    @property
+    def required(self) -> int:
+        return self.prompt_tokens + self.output_tokens + MESSAGE_OVERHEAD
+
+    @property
+    def fits(self) -> bool:
+        return self.required <= self.limit
+
+
+def compute(system: str, user: str, max_output_tokens: int, limit: int,
+            tokenizer: Tokenizer = estimate_tokens) -> Budget:
+    return Budget(tokenizer(system) + tokenizer(user), max_output_tokens, limit)