feat(ide): share curated IntelliJ project settings via workspace.yaml

Enforce JDK_25_PREVIEW language level through ws:upgrade-publish so
preview features stop red-underlining in IntelliJ while --enable-preview
builds cleanly via mvnw. Adopt ike-parent 102 which ships the sectioned
.gitignore output and the new IdeSettings-driven upgrade step.

- Bump ike-parent 100 → 102
- Add ide.language-level: JDK_25_PREVIEW to workspace.yaml
- Curated .idea/ slice now tracked: misc.xml, kotlinc.xml, encodings.xml,
  jarRepositories.xml, .idea/.gitignore
- .idea/compiler.xml, .idea/vcs.xml, .idea/workspace.xml stay ignored

Closes IKE-Network/ike-issues#135

Assisted-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: kec

pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>network.ike.pipeline</groupId>
         <artifactId>ike-parent</artifactId>
-        <version>100</version>
+        <version>102</version>
         <relativePath/>
     </parent>
     <groupId>dev.ikm.komet</groupId>