Add Poor Person's Skill pattern

[gregorriegler]

Summary

• Adds a new pattern: Poor Person's Skill — priming the context by asking the agent an open question (e.g. "What is important for doing vertical slicing?") when you don't have a skill or knowledge document at hand.
• Related to Semantic Anchors (shared mechanism: activating training knowledge) and Extract Knowledge (the heavier alternative this substitutes for).

Test plan

• npm run validate passes
• Pattern renders correctly on the detail page
• Relationship graph includes new edges

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