chore(template): clean-slate template snapshot from bb4a0c7

Curated, product-agnostic snapshot of the post-story-04 tree: demo
content deleted, auth-only reference feature, web-next shell, all gates
green. Product-specific docs, ADRs 027-029, PRDs/epics/archive, editor
library traces, and product naming are curated out; generic template
repairs (coverage provider devDeps, root test:coverage script, live
lint fixes, root-only release-please) are kept. See TEMPLATE.md for
provenance, curation list, and usage.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK

docs/decisions/adr-001-monorepo-tool.md

@@ -0,0 +1,19 @@
+# ADR-001: Turborepo + pnpm for Monorepo
+
+## Status: Accepted
+
+## Context
+
+Need a monorepo tool for a clean architecture template with multiple apps and shared packages.
+
+## Decision
+
+Turborepo + pnpm workspaces.
+
+## Rationale
+
+- Clean architecture already provides organizational structure — Nx's opinions would compete
+- Minimal config (turbo.json + pnpm-workspace.yaml) means agents understand the setup quickly
+- Excellent caching — shared packages build once and are reused
+- Battle-tested pairing, both reference repos use it
+- Works naturally with Vite for non-Next packages