chore(context): adopt canonical context-sync.sh and re-sync adapters

infra's scripts/context-sync.sh is the estate canonical, and it moved in infra
262369b (a SIGPIPE fix on the placeholder-reporting path: `printf | grep -o |
head -1` became `head -1 < <(grep -o ...)`). Every other repo still carried the
old line, so ContextSyncScriptDrift and ContextAdapterDrift were both firing.

Also picks up the canonical AGENT.md change from local-dev a01ee80 — rule 5's
GitOps review lane and the new precedence rule — which every repo's adapters
need regenerated for regardless of the script.

Refs mathias/infra#470

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

scripts/context-sync.sh

@@ -58,7 +58,7 @@ if [ "$FORCE" = false ]; then
     while IFS= read -r _match; do
       _lineno="${_match%%:*}"
       _content="${_match#*:}"
-      _token=$(printf '%s' "$_content" | grep -o '{{[^}]*}}' | head -1)
+      _token=$(head -1 < <(grep -o '{{[^}]*}}' <<<"$_content"))
       echo "  $PROJECT_FILE:$_lineno: unfilled placeholder $_token" >&2
     done <<< "$_placeholders"
     echo "" >&2