- Fix action nodes to use next_node_id (not children) for continuation,
matching how TreeNavigationPage.tsx navigates action nodes
- Validator now requires next_node_id on all action nodes and flags
missing ones as broken dead ends
- Update _check_branch_termination: action nodes are not dead ends since
they continue via next_node_id (validated separately)
- Improve scaffold prompt: branch names must describe observable symptoms
users can self-identify, not internal category names
- Update branch_detail prompt with clearer action node schema, corrected
few-shot example showing proper next_node_id on action nodes
- Improve assemble_tree root question to be more user-facing
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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