Add v0.2.0 features: vector search + tool permissions

- Local vector search: Ollama embeddings + semantic search
  - get-embedding with caching
  - cosine-similarity computation
  - semantic-search cognitive tool
  - :semantic-search tool for LLM queries

- Tool permission tiers: security gating for cognitive tools
  - Three tiers: :allow, :deny, :ask
  - Gate in execute-tool-action before tool runs
  - Defaults: :deny for shell/delete-file, :ask for eval/write-file
  - :tool-permissions cognitive tool for management

- Embedding provider support: Ollama AND llama.cpp
  - EMBEDDING_PROVIDER env var
  - EMBEDDING_MODEL env var
  - LLAMA_HOST for llama.cpp server

- .env.example: Add embedding config variables
- Fix parse-message in communication.lisp

- Update ASDF: add test files, tool-permissions skill

All 60 tests pass (6 suites x 100%)

library/package.lisp

@@ -167,3 +167,16 @@
         (setq *system-logs* (subseq *system-logs* 0 *max-log-history*))))
     (format t "~a~%" formatted-msg)
     (finish-output)))
+
+(defun proto-get (plist key)
+  "Robustly retrieves a value from a plist, checking both uppercase and lowercase keyword versions."
+  (let* ((s (string key))
+         (up (intern (string-upcase s) :keyword))
+         (dn (intern (string-downcase s) :keyword)))
+    (or (getf plist up) (getf plist dn))))
+
+(defun get-cognitive-tool-body (tool-name)
+  "Retrieves the body function of a cognitive tool, or nil if not found."
+  (let ((tool (gethash (string-downcase (string tool-name)) *cognitive-tools*)))
+    (when tool
+      (cognitive-tool-body tool))))