Remove dead agent roles, prompts, and unused node types

[osilkin98]

Context

After removing dead workflow modes (#1346), several agent roles and prompt files become orphaned. Additionally, node types used only by removed modes can be pruned from primitives.py.

Dead agent roles & prompts to remove

Role/Prompt	Used exclusively by	Evidence
failure_analyst role + prompt	research_workflow (removed in #1346)	1 reference in definitions.py
refiner role + prompt	refine_workflow (removed in #1346)	Only in refine mode
skill_reviewer role + prompt	skill_refine_workflow (removed in #1346)	Only in skill-refine mode
spec_patcher.md prompt	spec_update_workflow (removed in #1346)	1 reference per PR #1302
profiler.md prompt	factory profile command (being removed)	Backs user profile generation
factory/agents/prompts/frontend_design/ subdirectory	3 frontend-design modes (removed in #1346)	Exclusive backing prompts

Unused node types to remove from primitives.py

Node Type	Used only by	Evidence
SubgraphForkNode	parallel_improve_workflow (removed)	Community issue #1328
SelectionNode	parallel_improve_workflow (removed)	Community issue #1328
LLMNode	mini-swebench contributed workflow + pruned skillopt	Community issue #1328

Also remove handling for these node types from: executor.py, skill_export.py, workflow/__init__.py exports.

What to keep

• All 8 agent roles used by design/create: researcher, strategist, builder, health_checker, code_reviewer, adversarial_tester, archivist, ceo
• refactory.md prompt (refactory agent is explicitly kept)
• spec_annotator.md (supports spec-generate, which design depends on)
• All static playbook files at factory/agents/playbooks/*.md
• Update AgentRole enum to remove dead roles

Related

• Depends on Remove dead workflow modes from definitions.py and registry #1346 (dead workflow modes removed first)
• Resolves Prune unused node types: SubgraphForkNode, SelectionNode, LLMNode #1328 (prune unused node types)
• Dead-code pruning report — comprehensive analysis of ~7,800 removable lines #1301 (dead-code pruning report)

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