chore: add K9 Kennel-level metadata guard

Proof system invariants: 0 Admitted max, forbidden proof
bypass patterns, multi-prover support declared.

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

Author: hyperpolymath

contractiles/k9/echidna-metadata.k9.ncl

@@ -0,0 +1,91 @@
+K9!
+# SPDX-License-Identifier: PMPL-1.0-or-later
+# Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
+# K9 Kennel-level guard: echidna project metadata and proof-system invariants
+# Security Level: Kennel (data-only, no execution)
+# No signature required
+
+{
+  pedigree = {
+    schema_version = "1.0.0",
+    component_type = "proof-tool-metadata",
+    security = {
+      leash = 'Kennel,
+      trust_level = "data-only",
+      allow_network = false,
+      allow_filesystem_write = false,
+      allow_subprocess = false,
+    },
+    metadata = {
+      name = "echidna-metadata",
+      version = "2.1.0",
+      description = "Echidna: neurosymbolic theorem proving platform — project invariants",
+      author = "Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>",
+    },
+  },
+
+  # Project configuration
+  config = {
+    # Proof system invariants (CRITICAL)
+    proof_system = {
+      # Dangerous proof bypasses that must NEVER appear in proofs
+      forbidden_proof_patterns = [
+        "believe_me",
+        "assert_total",
+        "Admitted",
+        "sorry",
+        "unsafeCoerce",
+        "Obj.magic",
+        "postulate",
+      ],
+      # All proofs must be complete (no Admitted/sorry)
+      admitted_count_max = 0,
+    },
+
+    # Multi-prover support requirements
+    supported_provers = [
+      "coq",
+      "lean4",
+      "idris2",
+      "agda",
+    ],
+
+    # Safety invariants
+    safety = {
+      forbidden_patterns = [
+        "unwrap()",
+        "expect()",
+        "todo!()",
+        "unimplemented!()",
+      ],
+    },
+
+    # Test requirements
+    tests = {
+      min_unit_tests = 50,
+      integration_tests_required = true,
+      proof_verification_required = true,
+    },
+
+    # Build configuration
+    build = {
+      edition = "2021",
+      msrv = "1.75",
+    },
+
+    # Language policy
+    banned_files = ["Makefile", "Dockerfile"],
+    banned_languages = ["python", "typescript", "javascript", "go"],
+  },
+
+  # RSR compliance
+  rsr = {
+    explainme = true,
+    ai_manifest = true,
+    machine_readable = true,
+    spdx_headers_required = true,
+    security_md_required = true,
+    idris2_abi = true,
+    zig_ffi = true,
+  },
+}