docs(work): scaffold fallow-integration-v1 epic + stories

docs/work/fallow-integration-v1/01-fallow-install/_story.md

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+---
+id: 01-fallow-install
+epic: fallow-integration-v1
+title: Install fallow + create .fallowrc.json
+type: technical-story
+status: in-progress
+feature: tooling
+depends-on: []
+blocks: [02-pnpm-turbo-wiring]
+---
+
+## Tasks
+
+- [ ] Story scaffold
+- [ ] Add fallow to root devDependencies
+- [ ] Create .fallowrc.json with monorepo-aware config
+- [ ] Verify `pnpm exec fallow --version` works