docs(work): scaffold elicitation-prompts-v1 epic + stories

docs/work/elicitation-prompts-v1/_epic.md

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+---
+id: elicitation-prompts-v1
+prd: null
+title: Elicitation + dispatch prompt templates
+type: epic
+status: in-progress
+features: [tooling, agent-prompts]
+created: 2026-05-13
+---
+
+## Goal
+
+Ship five prompt templates under `.sandcastle/` so the future orchestrator
+(and humans manually copy-pasting) can dispatch PRD elicitation, ADR
+elicitation, decomposition, implementation, and review with a consistent
+shape. Every template enforces the generator-first rule.
+
+## Stories
+
+- [ ] [01 — .sandcastle/ scaffold + README](01-sandcastle-scaffold/_story.md)
+- [ ] [02 — PRD + ADR elicitation prompts](02-elicitation-prompts/_story.md)
+- [ ] [03 — Decomposer + implementer + reviewer prompts](03-dispatch-prompts/_story.md)