chore(release): bump version to 0.12.1

Cuts the launcher JRE-bootstrap fixes (system-Java reuse + WSL cross-fs
extract) into 0.12.1.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: leifericf

CHANGES.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+## 0.12.1
+
 ### Fixes
 
 - **`noum` reuses an existing system Java when one is available** — the launcher used to unconditionally download a ~200MB JRE to `~/.noumenon/jre/` on first run, even when the user already had Java 21+ installed. It now checks `$JAVA_HOME` and `java` on `PATH` first; if either points at a Java 21+ runtime (the minimum the uberjar targets — older JVMs fail with `UnsupportedClassVersionError` at class-load time), the launcher uses it and skips the download. The bundled JRE remains the fallback for users on Java 17 or older, or with no Java at all.

resources/version.edn

@@ -1 +1 @@
-{:version "0.12.0"}
+{:version "0.12.1"}