feat: quadrant-based model routing with per-slot provider cascades

lisp/core-loop-perceive.lisp

@@ -129,4 +129,3 @@ FN receives (signal) and returns T if consumed, nil to continue."
 (test test-depth-limiting
   (let ((runaway-signal (list :type :EVENT :depth 11 :payload (list :sensor :heartbeat))))
     (is (null (process-signal runaway-signal)))))
-(defun bad-code () (broken

lisp/core-loop-reason.lisp

@@ -20,20 +20,23 @@
           (let ((backend-fn (gethash backend *backend-registry*)))
             (when backend-fn
               (log-message "PROBABILISTIC: Attempting backend ~a..." backend)
-              (let* ((model (when *model-selector*
-                              (funcall *model-selector* backend context)))
-                     (result (if model
-                                 (funcall backend-fn prompt system-prompt :model model)
-                                 (funcall backend-fn prompt system-prompt))))
-                (cond ((and (listp result) (eq (getf result :status) :success))
-                       (return (getf result :content)))
-                      ((stringp result)
-                       (return result))
-                      (t
-                       (log-message "PROBABILISTIC: Backend ~a failed: ~a"
-                                   backend (getf result :message))))))))
+              (let* ((model-val (when *model-selector*
+                                  (funcall *model-selector* backend context))))
+                (if (eq model-val :skip)
+                    (log-message "PROBABILISTIC: Skipping ~a (filtered)" backend)
+                    (let* ((model (if model-val model-val nil))
+                           (result (if model
+                                       (funcall backend-fn prompt system-prompt :model model)
+                                       (funcall backend-fn prompt system-prompt))))
+                      (cond ((and (listp result) (eq (getf result :status) :success))
+                             (return (getf result :content)))
+                            ((stringp result)
+                             (return result))
+                            (t
+                             (log-message "PROBABILISTIC: Backend ~a failed: ~a"
+                                         backend (getf result :message)))))))))))
         (list :type :LOG
-              :payload (list :text "Neural Cascade Failure: All providers exhausted.")))))
+              :payload (list :text "Neural Cascade Failure: All providers exhausted."))))
 
 (defun markdown-strip (text)
   (if (and text (stringp text))

lisp/system-model-router.lisp

@@ -0,0 +1,88 @@
+(defvar *model-cascade-code* nil
+  "Cascade for :code tasks: ((:ollama . \"model\") ...)")
+
+(defvar *model-cascade-plan* nil
+  "Cascade for :plan tasks.")
+
+(defvar *model-cascade-chat* nil
+  "Cascade for :chat tasks.")
+
+(defvar *model-cascade-background* nil
+  "Cascade for background tasks (heartbeat, delegation).")
+
+(defvar *local-backends* '(:ollama :llama-cpp)
+  "Backend keywords considered local (privacy-safe).")
+
+(defun model-classify-complexity (text)
+  "Classify TEXT into :code, :plan, or :chat."
+  (let ((lower (string-downcase text)))
+    (cond
+      ((or (search "defun" lower) (search "defmacro" lower)
+           (search "write" lower) (search "refactor" lower)
+           (search "fix " lower) (search "implement" lower)
+           (search "code" lower)
+           (search "#+begin_src" lower))
+       :code)
+      ((or (search "plan" lower) (search "roadmap" lower)
+           (search "strategy" lower) (search "design" lower)
+           (search "architecture" lower))
+       :plan)
+      (t :chat))))
+
+(defun model-cascade-find (cascade backend)
+  "Find first (PROVIDER . MODEL) in CASCADE matching BACKEND."
+  (assoc backend cascade
+         :test (lambda (a b) (string-equal (string a) (string b)))))
+
+(defun model-select (backend context)
+  "Select model for BACKEND given CONTEXT signal.
+Returns model name or :skip."
+  (let* ((payload (getf context :payload))
+         (text (or (getf payload :text) ""))
+         (sensor (getf payload :sensor))
+         (has-personal (and (boundp '*dispatcher-privacy-tags*)
+                            (some (lambda (tag) (search tag text))
+                                  (symbol-value '*dispatcher-privacy-tags*))))
+         (is-local (member backend *local-backends*)))
+    ;; Privacy: skip cloud backends for personal content
+    (when (and has-personal (not is-local))
+      (log-message "MODEL-ROUTER: Skipping ~a (personal content)" backend)
+      (return-from model-select :skip))
+    ;; Quadrant: background tasks use background cascade
+    (if (member sensor '(:heartbeat :delegation :tool-output :loop-error))
+        (let ((entry (car (or *model-cascade-background*
+                              '((:ollama . "phi-2"))))))
+          (cdr entry))
+        ;; Foreground: classify complexity, use slot cascade
+        (let* ((slot (model-classify-complexity text))
+               (cascade (case slot
+                          (:code *model-cascade-code*)
+                          (:plan *model-cascade-plan*)
+                          (t *model-cascade-chat*)))
+               (entry (model-cascade-find
+                       (or cascade '((:ollama . "qwen2.5:14b"))) backend)))
+          (if entry (cdr entry) :skip)))))
+
+(defun model-router-init ()
+  "Read env vars and wire model-select into *model-selector*."
+  (flet ((parse-cascade (str)
+           (when (and str (> (length str) 0))
+             (let ((*read-eval* nil))
+               (read-from-string str)))))
+    (setf *model-cascade-code* (parse-cascade (uiop:getenv "MODEL_CASCADE_CODE"))
+          *model-cascade-plan* (parse-cascade (uiop:getenv "MODEL_CASCADE_PLAN"))
+          *model-cascade-chat* (parse-cascade (uiop:getenv "MODEL_CASCADE_CHAT"))
+          *model-cascade-background* (parse-cascade (uiop:getenv "MODEL_CASCADE_BACKGROUND"))
+          *local-backends* (let ((env (uiop:getenv "LOCAL_BACKENDS")))
+                             (if env
+                                 (mapcar (lambda (s) (intern (string-upcase (string-trim " " s)) :keyword))
+                                         (uiop:split-string env :separator '(#\,)))
+                                 '(:ollama :llama-cpp)))))
+    (setf *model-selector* #'model-select)
+    (log-message "MODEL-ROUTER: Initialized, selector=~a" *model-selector*))
+
+(defskill :passepartout-model-router
+  :priority 250
+  :trigger (lambda (ctx) (declare (ignore ctx)) nil))
+
+(model-router-init)