Fix VERSION not included in Nix package and Makefile bundle

- flake.nix: copy VERSION file to $out/ so josh_sync_version() finds it
- Makefile: add lib/onboard.sh to the bundle loop

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

Makefile

@@ -23,7 +23,7 @@ dist/josh-sync: bin/josh-sync lib/*.sh VERSION
 	@echo '# Generated by: make build' >> dist/josh-sync
 	@echo '' >> dist/josh-sync
 	@# Inline all library modules (strip shebangs and source directives)
-	@for f in lib/core.sh lib/config.sh lib/auth.sh lib/state.sh lib/sync.sh; do \
+	@for f in lib/core.sh lib/config.sh lib/auth.sh lib/state.sh lib/sync.sh lib/onboard.sh; do \
 		echo "# --- $$f ---" >> dist/josh-sync; \
 		grep -v '^#!/' "$$f" | grep -v '^# shellcheck source=' >> dist/josh-sync; \
 		echo '' >> dist/josh-sync; \

flake.nix

@@ -28,6 +28,7 @@
 
             installPhase = ''
               mkdir -p $out/{bin,lib}
+              cp VERSION $out/
               cp lib/*.sh $out/lib/
               cp bin/josh-sync $out/bin/
               chmod +x $out/bin/josh-sync