refactor!: claim references are claim:TAG

lode is renamed paperclaim. A claim reference is claim:TAG or
claim:host/TAG and a pin claim:TAG@hex6 (claimRef and claimPin in
common.schema.json, spec/18 §18.4, spec/02, spec/20); the eight-character
tags do not change. A project names its claim namespace as
claims.paperclaim, and the main example's targeted receipts take the
scope targeted:paperclaim. No old prefix or name is accepted.

paperspec build regenerated the fixtures and vectors: the claim link's and
the symbol's record IDs, the layer receipt, project.json, the two targeted
receipts and Ben's spot-check, the QA report, the inclusion proof, the log's
checkpoint and tiles, and the signature, spot-check, VRF and checkpoint
vectors. The walkthrough and examples quote the new receipt IDs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SarHTuHhV9cS85XWy2NrLJ

docs/examples.md

@@ -193,12 +193,12 @@ for (row,) in rows:
 ('a4jrz2t', 'F0')
 ('xjns57z', 'F0')
 ('hca6dc5',)
-('ana', 'targeted:lode', 3)
-('ana', 'targeted:lode', 23)
+('ana', 'targeted:paperclaim', 3)
+('ana', 'targeted:paperclaim', 23)
 ('ana', 'section:p36k8t6', 2)
 ('cara', 'page:2', 3)
 ('ana', 'targeted:captions', 3)
-('ben', 'qa:y2zw8ctg5s8dp', 10)
+('ben', 'qa:fhhvg9qrzqp0n', 10)
 ('ben', 'qa:gx2s84z9jf9xv', 3)
 Bond parameters
 CT–CT | 310.0 | 1.526 | 305.2 | 1.5260
@@ -210,7 +210,7 @@ The first query reads the level the converter recorded, not the final one.
 A receipt is a signed record that a reviewer checked certain nodes against the page.
 Receipts by `ana` raise `ec5jc93` and `a4jrz2t` to F3; `xjns57z` stays at F0 because the only receipt that covered it, by `cara`, was revoked.
 To compute the final level, check each receipt's signature, revocations and spot-checks, as [chapter 8](../spec/08-fidelity.md#82-levels) describes.
-The `scope` column of the third query shows the value `targeted:lode`, which is data in the fixture, copied here exactly as the query prints it.
+The `scope` column of the third query shows the value `targeted:paperclaim`, which is data in the fixture, copied here exactly as the query prints it.
 
 ## Test your implementation against a vector