move v0.1 artifacts to DELETE/, fix xcode build, bump calver to 2026.03.14

- move backend/, clients/, scripts/ to DELETE/ (v0.1 era, replaced by on-device arch)
- delete feature/v0.1-backend-and-macos branch
- add TaskStore dependency to project.yml
- fix ComposeViewModel deinit concurrency, make toMessageSummary public
- regenerate Xcode project, verify macOS build succeeds

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

DELETE/backend/.gitignore

@@ -0,0 +1,37 @@
+# dependencies (bun install)
+node_modules
+
+# output
+out
+dist
+*.tgz
+
+# code coverage
+coverage
+*.lcov
+
+# logs
+logs
+_.log
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# database files
+*.db
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# caches
+.eslintcache
+.cache
+*.tsbuildinfo
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store