Add CTO Case adapter contract

tools/validate_cto_child.py

@@ -20,6 +20,7 @@ REQUIRED_FILES = [
     "sot/03-PROTOCOLS/CTO-CASE-CANDIDATE-BACKEND-ISSUES.md",
     "sot/03-PROTOCOLS/CTO-HARNESS-EVIDENCE-INTERFACE-CONTRACT.md",
     "sot/03-PROTOCOLS/CTO-CASE-SOURCE-ADMISSION-RECORD.md",
+    "sot/03-PROTOCOLS/CTO-CASE-ADAPTER-CONTRACT.md",
 ]
 
 REQUIRED_BRIEF_PHRASES = [
@@ -97,6 +98,27 @@ REQUIRED_SOURCE_ADMISSION_PHRASES = [
     "No moving branch reference may be used as proof without a pinned commit or tag.",
 ]
 
+REQUIRED_ADAPTER_CONTRACT_PHRASES = [
+    "Local planning SOT only. Not a Core Protocol. Not active Core authority.",
+    "This contract does not authorize Runtime behavior",
+    "register backend id `case` as a gated engine before execution",
+    "require the harness to accept `--engine case` only when explicitly enabled",
+    "prevent a parallel runner path outside the existing harness seam",
+    "`case` must be disabled by default.",
+    "No missing gate may degrade to a warning. Missing gate means blocked.",
+    "Adapter Input Contract",
+    "Adapter Output Contract",
+    "CTO Eligibility Decision",
+    "`selected_backend`",
+    "`denied_backends`",
+    "`required_gates`",
+    "`missing_gates`",
+    "`allowed_mutation_mode`",
+    "Case must not create or override the Eligibility Decision.",
+    "Case may recommend. Case must not approve itself or select its own authority.",
+    "This contract deliberately does not create `case-engine.sh`.",
+]
+
 
 def main() -> int:
     checked: list[str] = []
@@ -164,6 +186,16 @@ def main() -> int:
             if phrase not in text:
                 errors.append(f"missing_source_admission_phrase:{phrase}")
 
+    adapter_contract = ROOT / "sot/03-PROTOCOLS/CTO-CASE-ADAPTER-CONTRACT.md"
+    if adapter_contract.is_file():
+        text = adapter_contract.read_text(encoding="utf-8")
+        if "core_promotion_status: not-promoted" not in text:
+            errors.append("adapter_contract_missing_not_promoted_frontmatter")
+        for phrase in REQUIRED_ADAPTER_CONTRACT_PHRASES:
+            checked.append(f"adapter_contract_phrase:{phrase}")
+            if phrase not in text:
+                errors.append(f"missing_adapter_contract_phrase:{phrase}")
+
     board = ROOT / "WORKBOARD.yaml"
     if board.is_file():
         text = board.read_text(encoding="utf-8")
@@ -177,6 +209,8 @@ def main() -> int:
             errors.append("workboard_cto_work_004_not_validated")
         if "CTO-CASE-SOURCE-ADMISSION-RECORD.md" not in text:
             errors.append("workboard_missing_source_admission_record_source")
+        if "CTO-CASE-ADAPTER-CONTRACT.md" not in text:
+            errors.append("workboard_missing_adapter_contract_source")
 
     payload = {
         "ok": not errors,