Apply GH-DEC-2026-017 and GH-DEC-2026-020 to the layer declaration.

This repository never received GH-DEC-2026-017 (gate-house's gap, recorded
in GH-DEC-2026-020), so both rulings land here together.

- INTENT.md frontmatter: remove standard_version: "0.7" (017 section 5) and
  de-version the standard: path to net-kingdom/canon/standards/
  security-layer-model (020 section 1). layer: Staff is unchanged and
  INTENT.md remains the declaration (017 section 1); no layer.yaml added.
- tests/test_layer_declaration.py: stop asserting the old
  standard_version; case-fold the layer comparison (017 section 2); fail if
  any frontmatter key or value carries a standard or companion version,
  including a versioned standard: path or companion_version (020 sections
  1-2); comments are not reached. Known-bad forms are exercised.

conformance_state is left untouched pending gate-house's open question.

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

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 63291@bnt-lap001
Assistant-Session: 8bd77868-ca68-4f49-bb1e-d539ecc0d703

INTENT.md

@@ -1,8 +1,7 @@
 ---
 layer: Staff
 role: null
-standard: net-kingdom/canon/standards/security-layer-model_v0.7.md
-standard_version: "0.7"
+standard: net-kingdom/canon/standards/security-layer-model
 companion: net-kingdom/SECURITY-COMPANION.md
 declared_at: "2026-09-01"
 conformance_state: blocked-clean

tests/test_layer_declaration.py

@@ -1,12 +1,53 @@
+import re
 from pathlib import Path
 
+# A version of the standard or its companion, anywhere in a key or value:
+# `_v0.7`, `v0.8`, `"0.7"` and the like (GH-DEC-2026-017 §5, GH-DEC-2026-020 §1-§2).
+VERSION_PATTERN = re.compile(r"(?:^|[^0-9A-Za-z])v?\d+\.\d+(?:\.\d+)?(?![0-9])", re.IGNORECASE)
+
+
+def _frontmatter():
+    text = Path("INTENT.md").read_text(encoding="utf-8")
+    assert text.startswith("---\n")
+    return text, text.split("---\n", 2)[1]
+
+
+def _entries(frontmatter):
+    for line in frontmatter.splitlines():
+        line = line.split(" #", 1)[0].rstrip()  # comments are not reached
+        if not line or line.lstrip().startswith("#") or ":" not in line:
+            continue
+        key, value = line.split(":", 1)
+        yield key.strip(), value.strip().strip('"').strip("'")
+
 
 def test_intent_declares_staff_in_own_voice():
-    text = Path("INTENT.md").read_text(encoding="utf-8")
-    assert text.startswith("---\n")
-    frontmatter = text.split("---\n", 2)[1]
-    assert "layer: Staff" in frontmatter
-    assert 'standard_version: "0.7"' in frontmatter
+    text, frontmatter = _frontmatter()
+    layers = [v for k, v in _entries(frontmatter) if k == "layer"]
+    # ASCII case-fold before comparing; nobody re-spells (GH-DEC-2026-017 §2).
+    assert [v.casefold() for v in layers] == ["staff"]
     assert "conformance_state: blocked-clean" in frontmatter
     assert "gate-house insert that used to sit here is" in text
     assert "does not author our probes" in text
+
+
+def test_declaration_carries_no_standard_or_companion_version():
+    _, frontmatter = _frontmatter()
+    for key, value in _entries(frontmatter):
+        if key == "declared_at":
+            continue  # a date, not a version of the standard
+        assert key not in {"standard_version", "companion_version"}, key
+        assert "version" not in key.casefold(), key
+        assert not VERSION_PATTERN.search(value), f"{key}: {value}"
+
+
+def test_version_detector_catches_known_bad_forms():
+    bad = [
+        'standard: net-kingdom/canon/standards/security-layer-model_v0.7.md',
+        'standard_version: "0.7"',
+        'companion_version: "0.2"',
+        'companion: net-kingdom/SECURITY-COMPANION_v0.2.md',
+    ]
+    for line in bad:
+        key, value = next(_entries(line))
+        assert "version" in key or VERSION_PATTERN.search(value), line