T-1: initialize monorepo structure with backend and frontend scaffolds

Backend: Spring Boot 3.5.11 on Java 25, Maven with wrapper, hexagonal
architecture package layout (domain/application/adapter/config), health
endpoint with integration test. Originally planned for Spring Boot 4.0
but pivoted due to massive package reorganization in 4.0 (see addenda
in research and plan docs).

Frontend: Vue 3 scaffolded via create-vue with TypeScript, Vue Router,
Vitest, ESLint, Prettier. Pivoted from Svelte due to ecosystem maturity
concerns (broken router ecosystem for Svelte 5).

Also: extended .gitignore for Java/Maven and Node/Vue artifacts, updated
CLAUDE.md with tech stack, build commands, agent documentation sections,
and document integrity rule.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -9,3 +9,48 @@ Thumbs.db
 
 # Claude Code (machine-local)
 .claude/settings.local.json
+.rodney/
+.agent-tests/
+
+# Java/Maven
+*.class
+*.jar
+*.war
+*.ear
+*.nar
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+.mvn/wrapper/maven-wrapper.jar
+.classpath
+.project
+.settings/
+.factorypath
+.springBeans
+.sts4-cache
+hs_err_pid*
+replay_pid*
+*.log
+
+# Node.js/Vue/Vite
+node_modules/
+dist/
+build/
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*
+npm-debug.log*
+
+# Environment
+.env
+.env.*
+!.env.example
+
+# Editor swap files
+*.swp
+*.swo
+*~
+\#*\#
+.#*