PSF: Complete 'Thin Harness' refactor and move kernel logic to skills

src/embedding-logic.lisp

@@ -0,0 +1,60 @@
+(in-package :org-agent)
+
+(defun get-embedding (text)
+  "Retrieves a vector representation of text via the configured neural provider."
+  (let* ((auth (get-provider-auth :gemini)) 
+         (api-key (getf auth :api-key))
+         (endpoint "https://generativelanguage.googleapis.com/v1beta/models/text-embedding-004:embedContent"))
+    (unless api-key 
+      (kernel-log "EMBEDDING ERROR: No API key for :gemini")
+      (return-from get-embedding nil))
+    (let* ((url (format nil "~a?key=~a" endpoint api-key)) 
+           (headers `(("Content-Type" . "application/json")))
+           (body (cl-json:encode-json-to-string 
+                  `((model . "models/text-embedding-004") 
+                    (content . ((parts . ((text . ,text)))))))))
+      (handler-case 
+          (let* ((response (dex:post url :headers headers :content body))
+                 (json (cl-json:decode-json-from-string response))
+                 (embedding (getf (getf json :embedding) :values)))
+            embedding)
+        (error (c) 
+          (kernel-log "EMBEDDING FAILURE: ~a" c) 
+          nil)))))
+
+(defun dot-product (v1 v2) 
+  "Calculates the dot product of two numerical vectors."
+  (reduce #'+ (mapcar #'* v1 v2)))
+
+(defun magnitude (v) 
+  "Calculates the Euclidean magnitude of a numerical vector."
+  (sqrt (reduce #'+ (mapcar (lambda (x) (* x x)) v))))
+
+(defun cosine-similarity (v1 v2)
+  "Calculates the semantic distance between two vectors."
+  (let ((m1 (magnitude v1)) 
+        (m2 (magnitude v2))) 
+    (if (or (zerop m1) (zerop m2)) 0 (/ (dot-product v1 v2) (* m1 m2)))))
+
+(defun find-most-similar (query-vector top-k)
+  "Identifies the top-k most semantically related objects in the store."
+  (let ((similarities nil))
+    (maphash (lambda (id obj) 
+               (declare (ignore id))
+               (let ((vec (org-object-vector obj))) 
+                 (when vec 
+                   (push (cons (cosine-similarity query-vector vec) obj) similarities)))) 
+             *object-store*)
+    (let ((sorted (sort similarities #'> :key #'car))) 
+      (subseq sorted 0 (min top-k (length sorted))))))
+
+(defskill :skill-embedding
+  :priority 50
+  :trigger (lambda (ctx) (eq (getf (getf ctx :payload) :sensor) :embedding-request))
+  :neuro nil
+  :symbolic (lambda (action ctx)
+              (declare (ignore ctx))
+              (case (getf action :action)
+                (:get-embedding (get-embedding (getf action :text)))
+                (:similarity (cosine-similarity (getf action :v1) (getf action :v2)))
+                (t action))))