fix(docs): fill in v0.2.0 git sha in README dependency snippet

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: leifericf

README.md

@@ -51,7 +51,7 @@ java -jar target/noumenon-0.2.0.jar --version
 ```clojure
 {:aliases
  {:noumenon
-  {:extra-deps {io.github.leifericf/noumenon {:git/tag "v0.2.0" :git/sha "TBD"}}
+  {:extra-deps {io.github.leifericf/noumenon {:git/tag "v0.2.0" :git/sha "81fc309"}}
    :main-opts ["-m" "noumenon.main"]}}}
 ```