Rewrite planner/developer/task-runner descriptions with explicit "use
proactively" triggers and the model-mismatch condition, so the
orchestrating session self-routes to the right agent instead of relying
on CLAUDE.md prose being remembered each time.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Pin the model to the step, not the whole session, via .claude/agents/*.md frontmatter
instead of relying on a human to run /model at the right moment: planner (Opus, no
Edit/Write) for design work, developer (Sonnet) for implementation, task-runner (Haiku,
no Edit/Write) for mechanical read-only checks. CLAUDE.md documents the routing rule;
the backlog session protocol now names these agents instead of a manual /model instruction.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>