docs: plan optional native Kubernetes execution provider

.claude/skills/to-acceptance-plan/scripts/check-acceptance-plan-test.sh

@@ -100,6 +100,20 @@ sed_in_place 's/\*\*Expected tasks:\*\* deferred to orchestration/\*\*Expected t
 sed_in_place 's|<!-- combined rationale fixture placeholder -->|**Combined rationale:** The fixture is one indivisible documentation check, so separate plan review adds no value.|' "$combined_valid"
 bash "$checker" "$combined_valid" >/dev/null
 
+# Exceed pipe capacity after the first category: an early-exiting reader must
+# not turn a valid Split or Combined contract into a SIGPIPE failure.
+for source in "$valid" "$combined_valid"; do
+  large="$root/acceptance/large-${source##*/}"
+  awk '
+    { print }
+    /^- \*\*gRPC \/ protobuf:\*\*/ {
+      for (i = 0; i < 16384; i++)
+        print "  Additional interface detail keeps the contract larger than a pipe buffer."
+    }
+  ' "$source" >"$large"
+  bash "$checker" "$large" >/dev/null
+done
+
 for case_name in missing-contract invalid-contract missing-category bare-none placeholder bad-delivery bad-status proposed-unchecked missing-human placeholder-human checked-without-decision; do
   cp "$valid" "$root/acceptance/$case_name.md"
 done

docs/acceptance/README.md

@@ -111,6 +111,9 @@ PR after verification. There is no cleanup or status-only PR.
 
 ## Plans
 
+- [Native Kubernetes execution provider](native-kubernetes-execution.md) — separately deployed,
+  optional controller/executor service in this monorepo, with retained workspaces and kind
+  qualification. Status: draft; implementation is planned as a draft PR stacked on the plan PR.
 - [Purpose-attributed auxiliary token usage](auxiliary-token-usage.md) — records every reachable session-associated auxiliary LLM call in the canonical ledger under a purpose-specific provider/model-attributed kind, without changing main-run accounting or budgets. Status: proposed.
 - [Development-spine work classification](adr-scope-classification.md) — routes Spike,
   Routine, Bounded, and Architectural work; keeps acceptance planning for substantive work