fix: prevent subagent-driven-development from pausing every 3 tasks

requesting-code-review had "review after each batch (3 tasks)" for
executing-plans, which leaked into subagent-driven-development as a
check-in cadence. Replaced with flexible "each task or at natural
checkpoints" and added explicit continuous execution directive to
subagent-driven-development.

skills/requesting-code-review/SKILL.md

@@ -82,7 +82,7 @@ You: [Fix progress indicators]
 - Fix before moving to next task
 
 **Executing Plans:**
-- Review after each batch (3 tasks)
+- Review after each task or at natural checkpoints
 - Get feedback, apply, continue
 
 **Ad-Hoc Development:**

skills/subagent-driven-development/SKILL.md

@@ -11,6 +11,8 @@ Execute plan by dispatching fresh subagent per task, with two-stage review after
 
 **Core principle:** Fresh subagent per task + two-stage review (spec then quality) = high quality, fast iteration
 
+**Continuous execution:** Do not pause to check in with your human partner between tasks. Execute all tasks from the plan without stopping. The only reasons to stop are: BLOCKED status you cannot resolve, ambiguity that genuinely prevents progress, or all tasks complete. "Should I continue?" prompts and progress summaries waste their time — they asked you to execute the plan, so execute it.
+
 ## When to Use
 
 ```dot