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

packages/core-ui/docs/library-decisions/2026-05-14-react.md

@@ -0,0 +1,66 @@
+---
+package: react
+version: "^19.0.0"
+tier: core
+decision: approved
+date: 2026-05-14
+deciders: [scaffolded]
+adr: null
+filter-results:
+  license: MIT
+  types: "@types/react"
+  maintenance: active
+  boundary-fit: pass
+  shadow-check: pass
+  eu-residency: n/a
+  cve-scan: clean
+  named-consumer: pass
+verification-commands:
+  - pnpm audit --audit-level=moderate
+  - npm view react license
+accepted-cves: []
+---
+
+## Filter: license
+
+MIT — on the workspace allowlist.
+
+## Filter: types
+
+TypeScript types via `@types/react` (community-maintained but canonical; ships in sync with each React major).
+
+## Filter: maintenance
+
+Active. Maintained by Meta; v19 is the current stable major.
+
+## Filter: boundary-fit
+
+Core UI package. React is required for the component library; appropriate for `core-ui`. No boundary rule violation.
+
+## Filter: shadow-check
+
+React is already workspace-present in app packages. Same major version; no shadow.
+
+## Filter: eu-residency
+
+Client-side rendering library; no vendor data transmission. n/a.
+
+## Filter: cve-scan
+
+No advisories at adoption time.
+
+## Filter: named-consumer
+
+`core-ui` renders all atomic-design components (Button, Input, Label, FormField) as React components.
+
+## Prompt: replaces
+
+Nothing — React is already the UI framework in the workspace.
+
+## Prompt: migration-cost-out
+
+Impossible: React is the foundational UI library for this workspace.
+
+## Prompt: alternatives-considered
+
+React is workspace-locked as the UI framework. No alternative evaluated.