Publish the valid-but-unbound claim; the missing shape was confounded

The example set satisfied §11's both-shapes clause only by accident. Both
values of pdp_digest and pdp_path appeared, but they appeared in perfect
correlation with validity: claim.valid carried a digest with pdp_path true,
claim.revoked carried null with pdp_path false, and nothing else existed.

Two independent dimensions presented as one. A reader could reasonably conclude
that pdp_digest is null because the claim is revoked, or that pdp_path tracks
validity. Both are false, and the example set is what would have taught them --
the failure the both-shapes clause exists to catch, which this repo proposed and
then shipped a case of.

The missing shape is the consequential one: a claim that is entirely valid --
valid_now true, reason_code ok, not consumed -- and carries no PDP binding. It
is usable for a consumer comparing the native binding.digest and unusable on the
GH-DEC-2026-003 path, where a PEP MUST refuse it. valid_now true is not
permission to proceed on that lane. A consumer writing that refusal previously
had no published shape to test against and would have had to invent a fixture,
which is the drift §12 names.

examples/claim.valid.no-pdp.json publishes it. The tests now assert the
decorrelation rather than mere presence: one requires a valid claim with no PDP
binding to exist, the other requires valid claims to cover both pdp_path
declarations. Verified both fail when the new example is removed, so they hold
the property rather than restating today's file list. 121 tests pass.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PM5HnEAhokxdfcPqBNpT7D

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 715850@bnt-lap001
Assistant-Session: eb557e93-7cb1-45d0-9e57-7d15b3edc60e

examples/claim.valid.no-pdp.json

@@ -0,0 +1,33 @@
+{
+  "schema_version": "0.1",
+  "kind": "approval-claim",
+  "yields_to": "net-kingdom taxonomy request-claim schema (statute §17; unassigned)",
+  "issuer": "approval-engine",
+  "approval_id": "7c4e2b91-08da-4f63-b5c7-2a9e6d1f04b3",
+  "state": "valid",
+  "valid_now": true,
+  "consumed": false,
+  "binding": {
+    "action": "release.publish",
+    "target": {
+      "id": "svc-approval-engine",
+      "stage": "prod"
+    },
+    "actor": "agt-release-runner",
+    "principal": "bernd",
+    "purpose": "cut-0-1-0-release",
+    "digest": "sha256:bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+    "pdp_digest": null,
+    "pdp_path": false
+  },
+  "freshness": {
+    "observed_at": "2026-08-29T12:00:00+00:00",
+    "ttl_seconds": 30,
+    "not_after": "2026-08-29T12:00:30+00:00"
+  },
+  "validity": {
+    "not_before": "2026-08-29T11:00:00+00:00",
+    "expires_at": "2026-08-29T15:00:00+00:00"
+  },
+  "reason_code": "ok"
+}