post_create: skip the install hint when deps already installed (#55)

The 'pnpm install' next-step is redundant when the LiveKit CLI already ran
the install task during `lk agent init --install`. Move it into a guarded
subtask that is skipped when LIVEKIT_DEPS_INSTALLED is set (the CLI sets it
on a successful install), matching the existing status-guard pattern used for
LIVEKIT_AGENT_NAME and LIVEKIT_SANDBOX_ID.

Author: u9g

taskfile.yaml

@@ -14,7 +14,7 @@ tasks:
       - echo 'To run the new agent locally:'
       - echo ''
       - echo '{{ indent .INDENT "cd" }} {{ .REL_PATH }}'
-      - echo '{{ indent .INDENT "pnpm install" }}'
+      - task: help_install_hint_if_needed
       - echo '{{ indent .INDENT "pnpm dev" }}'
       - echo ''
       - task: help_open_web_console
@@ -25,6 +25,14 @@ tasks:
       - task: set_agent_name_if_present
       - task: help_open_sandbox_if_present
 
+  help_install_hint_if_needed:
+    desc: "Print the local install hint, unless the CLI already installed dependencies"
+    status:
+      # Skip when `lk agent init --install` already ran the install task.
+      - test -n "$LIVEKIT_DEPS_INSTALLED"
+    cmds:
+      - echo '{{ indent .INDENT "pnpm install" }}'
+
   set_agent_name_if_present:
     desc: "When LIVEKIT_AGENT_NAME is set, configure the agent to use it on init"
     status: