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

.claude/hooks/stop-check-manifest-tests.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# Tier 3 — when the agent tries to stop, check whether feature.manifest.ts
+# changes have matching test changes. If manifest moved without tests,
+# nudge the agent to continue (exit 2 forces continuation).
+
+set -euo pipefail
+
+input=$(cat)
+
+# Loop guard — Claude Code sets stop_hook_active when a Stop hook already
+# forced continuation; don't loop infinitely.
+already_stopped=$(printf '%s' "$input" | jq -r '.stop_hook_active // false')
+if [ "$already_stopped" = "true" ]; then
+  exit 0
+fi
+
+# Only run inside the repo
+if ! git rev-parse --git-dir >/dev/null 2>&1; then
+  exit 0
+fi
+
+manifest_changed=$(git diff --name-only HEAD 2>/dev/null | grep -E 'feature\.manifest\.ts$' || true)
+
+if [ -z "$manifest_changed" ]; then
+  exit 0
+fi
+
+tests_changed=$(git diff --name-only HEAD 2>/dev/null | grep -E '\.test\.(ts|tsx)$' || true)
+
+if [ -n "$tests_changed" ]; then
+  exit 0
+fi
+
+cat >&2 <<EOF
+[stop-check] Manifest changes detected without matching test changes:
+
+${manifest_changed}
+
+Manifest-first ordering says: contracts + a red test must land before
+implementation. If you already shipped tests in a previous commit on this
+branch (and only the manifest changed this turn), say so and re-stop —
+this hook tracks unstaged + uncommitted-on-HEAD diffs only and can't tell.
+
+Otherwise, write the sibling test file(s) for any new use case before stopping.
+EOF
+
+exit 2