docs(work): scaffold sandcastle-dispatch-v1 epic + stories

docs/work/sandcastle-dispatch-v1/_epic.md

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+---
+id: sandcastle-dispatch-v1
+prd: null
+title: Sandcastle dispatch v1 — pnpm work dispatch with planning + execute modes
+type: epic
+status: in-progress
+features: [tooling, scripts]
+created: 2026-05-13
+---
+
+## Goal
+
+Install `@ai-hero/sandcastle` + ship `pnpm work dispatch` that picks the
+next ready AC bullet, prints the dispatch plan, and (with `--execute`)
+invokes sandcastle to run the implementer then reviewer.
+
+## Why
+
+The orchestrator closes the loop: docs/work/ tracks state, `.sandcastle/`
+holds the prompts, and dispatch.mjs connects them to sandcastle.
+
+## Stories
+
+- [ ] [01 — Install @ai-hero/sandcastle + Dockerfile](01-sandcastle-install/_story.md)
+- [ ] [02 — Dispatch planner (default mode)](02-dispatch-planner/_story.md)
+- [ ] [03 — Dispatch execute mode (sandcastle.run integration)](03-dispatch-execute/_story.md)
+- [ ] [04 — pnpm work dispatch wiring + tests](04-dispatch-cli-wiring/_story.md)