fix: build task's help echo executed 'task run' via backtick substitution (#80)

Both v0.1.0 release attempts hung the runner in darwin:run: the build
task's closing echo used backticks around 'task package' and
'task run' inside a sh string -- command substitution, so printing the
help message BUILT AND LAUNCHED the real app, which never exits
headless. Plain quotes now. Likely also the source of phantom local
Mill instances after any 'task build' (Standing #8's class).


Claude-Session: https://claude.ai/code/session_01FJ8wStsHyu7XPLTspNjMnQ

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: alicoding

Taskfile.yml

@@ -38,7 +38,11 @@ tasks:
     deps: [clean]
     cmds:
       - task: "{{.GOOS}}:build"
-      - 'echo "Built raw binary: {{.BIN_DIR}}/{{.APP_NAME}}{{exeExt}} -- this is NOT a launchable app bundle. Run `task package` to produce one, or `task run` to build and launch in one step."'
+      # Plain quotes, never backticks: backticks in a sh string are
+      # command substitution -- the previous wording executed
+      # 'task package' and 'task run' (launching the real app) just to
+      # print this message.
+      - 'echo "Built raw binary: {{.BIN_DIR}}/{{.APP_NAME}}{{exeExt}} -- this is NOT a launchable app bundle. Run ''task package'' to produce one, or ''task run'' to build and launch in one step."'
 
   package:
     summary: Packages a production build of the application