feat(scripts): add library-policy-nudge hook + smoke tests

Registers .claude/hooks/library-policy-nudge.sh under PreToolUse/Bash
and PostToolUse/Edit|Write|MultiEdit. The hook emits a non-blocking
system-reminder pointing at /evaluate-library before runtime deps are
added via pnpm add or via direct package.json edits, so policy
evaluation happens before the pre-commit gate fires.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/hooks/library-policy-nudge.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# Advisory — nudges the agent to run /evaluate-library before adding runtime
+# dependencies. Non-blocking (exit 0). Stdout is injected as system-reminder
+# context by the harness.
+#
+# Dispatches on payload shape:
+#   .tool_input.command   → PreToolUse / Bash  (pnpm add / pnpm i <pkg>)
+#   .tool_input.file_path → PostToolUse / Edit|Write (**/package.json edits)
+
+set -euo pipefail
+
+input=$(cat)
+
+# --- PreToolUse / Bash path ---
+cmd=$(printf '%s' "$input" | jq -r '.tool_input.command // ""')
+if [[ -n "$cmd" ]]; then
+  # Match: pnpm add <...> or pnpm i <pkg> — must have a space after keyword
+  if [[ "$cmd" =~ (^|[[:space:]])pnpm[[:space:]]+(add[[:space:]]|i[[:space:]]) ]]; then
+    # Skip dev-dependency installs — no policy evaluation needed for devDeps
+    if [[ ! "$cmd" =~ (^|[[:space:]])(-D|--save-dev)([[:space:]]|$) ]]; then
+      cat <<'EOF'
+[library-policy-nudge] Runtime dependency detected — evaluate before adding.
+
+Run the evaluate-library skill first:
+  /evaluate-library <name> --tier <feature|core|app> --target <package-path>
+
+This ensures the dependency is logged in docs/decisions/ before the pre-commit gate fires.
+EOF
+    fi
+  fi
+  exit 0
+fi
+
+# --- PostToolUse / Edit|Write path ---
+file_path=$(printf '%s' "$input" | jq -r '.tool_input.file_path // ""')
+if [[ "$file_path" == */package.json ]]; then
+  cat <<'EOF'
+[library-policy-nudge] package.json edited — verify any new runtime dependencies are evaluated.
+
+If you added a runtime dependency, run the evaluate-library skill:
+  /evaluate-library <name> --tier <feature|core|app> --target <package-path>
+
+This ensures the dependency is logged in docs/decisions/ before the pre-commit gate fires.
+EOF
+fi
+
+exit 0

.claude/hooks/library-policy-nudge.test.sh

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+# Smoke tests for library-policy-nudge.sh
+# Usage: bash .claude/hooks/library-policy-nudge.test.sh
+
+set -euo pipefail
+
+SCRIPT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/library-policy-nudge.sh"
+MARKER="/evaluate-library"
+PASS=0
+FAIL=0
+
+assert_contains() {
+  local name="$1"
+  local input="$2"
+  local output
+  output=$(printf '%s' "$input" | bash "$SCRIPT" 2>/dev/null)
+  if echo "$output" | grep -qF "$MARKER"; then
+    echo "  PASS: $name"
+    PASS=$((PASS + 1))
+  else
+    echo "  FAIL: $name"
+    echo "    Expected stdout to contain: $MARKER"
+    echo "    Got: ${output:-<empty>}"
+    FAIL=$((FAIL + 1))
+  fi
+}
+
+assert_no_output() {
+  local name="$1"
+  local input="$2"
+  local output
+  output=$(printf '%s' "$input" | bash "$SCRIPT" 2>/dev/null)
+  if ! echo "$output" | grep -qF "$MARKER"; then
+    echo "  PASS: $name"
+    PASS=$((PASS + 1))
+  else
+    echo "  FAIL: $name"
+    echo "    Expected no $MARKER in stdout, got: $output"
+    FAIL=$((FAIL + 1))
+  fi
+}
+
+echo "library-policy-nudge.sh smoke tests"
+echo "------------------------------------"
+
+# pnpm add <pkg> → reminder (runtime dep)
+assert_contains \
+  "pnpm add foo triggers reminder" \
+  '{"tool_input":{"command":"pnpm add foo"}}'
+
+# pnpm add -D <pkg> → no reminder (dev dep)
+assert_no_output \
+  "pnpm add -D foo produces no reminder" \
+  '{"tool_input":{"command":"pnpm add -D foo"}}'
+
+# pnpm add --save-dev <pkg> → no reminder (dev dep, long flag)
+assert_no_output \
+  "pnpm add --save-dev foo produces no reminder" \
+  '{"tool_input":{"command":"pnpm add --save-dev foo"}}'
+
+# Edit on non-package.json → no reminder
+assert_no_output \
+  "Edit on feature.manifest.ts produces no reminder" \
+  '{"tool_input":{"file_path":"/workspace/packages/auth/src/feature.manifest.ts"}}'
+
+# Edit on package.json → reminder
+assert_contains \
+  "Edit on package.json triggers reminder" \
+  '{"tool_input":{"file_path":"/workspace/packages/auth/package.json"}}'
+
+echo ""
+echo "Results: $PASS passed, $FAIL failed"
+[[ $FAIL -eq 0 ]]

.claude/settings.json

@@ -12,6 +12,10 @@
           {
             "type": "command",
             "command": "$CLAUDE_PROJECT_DIR/.claude/hooks/generator-first-nudge.sh"
+          },
+          {
+            "type": "command",
+            "command": "$CLAUDE_PROJECT_DIR/.claude/hooks/library-policy-nudge.sh"
           }
         ]
       }
@@ -23,6 +27,10 @@
           {
             "type": "command",
             "command": "$CLAUDE_PROJECT_DIR/.claude/hooks/post-manifest-edit.sh"
+          },
+          {
+            "type": "command",
+            "command": "$CLAUDE_PROJECT_DIR/.claude/hooks/library-policy-nudge.sh"
           }
         ]
       }