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

docs/work/fallow-integration-v1/04-docs-and-prompts/_story.md

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+---
+id: 04-docs-and-prompts
+epic: fallow-integration-v1
+title: Docs + agent prompt updates
+type: technical-story
+status: todo
+feature: agent-prompts
+depends-on: [03-ci-integration]
+blocks: []
+---
+
+## Tasks
+
+- [ ] Update CLAUDE.md conformance-system section to list Fallow as 5th gate
+- [ ] Update docs/guides/conformance-quickref.md with Fallow row
+- [ ] Update .sandcastle/implementer.prompt.md: run `fallow audit` before commit
+- [ ] Update .sandcastle/reviewer.prompt.md: verify implementer ran fallow audit
+- [ ] Final verification + closeout