docs(work): scaffold docs/work and conformance-system-v1 epic

docs/work/README.md

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+# docs/work — the local task system
+
+Filesystem-backed Epic/Story/Task hierarchy used by AI agents and humans alike.
+See `docs/architecture/agent-first-workflow-and-conformance.md` for the full
+design. Until the `work-system-v1` epic ships orchestration tooling, this
+folder is human-driven — agents read the files for context, humans flip
+checkboxes.
+
+## Layout
+
+- `prds/<date>-<slug>.prd.md` — source PRDs
+- `<epic-slug>/_epic.md` — one folder per epic
+- `<epic-slug>/<story-slug>/_story.md` — one folder per story
+- `<epic-slug>/<story-slug>/<task-slug>.task.md` — one file per task
+- `_templates/` — copy-paste templates (added in work-system-v1)
+- `_state.json` — derived index (added in work-system-v1)