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

fixtures/records/log/tile/entries/000.p/9

@@ -1,9 +1,9 @@
-["receipt","npc15pn6675z5","37b3025b54c6397e5f8d400912b5788cd6ce203059cd9143e7d521c2cdbf2917"]
-["receipt","y2zw8ctg5s8dp","ae17f8866a05ca1b671d96b7758984e11ac694acd6743835f107cb513c7cc600"]
+["receipt","vskq18t5sxydz","7fccee1468b9ef9bf712279f10d13f5544abb79db03e33b122a2504a3cf25789"]
+["receipt","fhhvg9qrzqp0n","f78c7704df1fbd815ac3ccf9114c82a189f9032ffcd75023e10b27b924f406b5"]
 ["receipt","mvjmb94nz7rdh","a4dca8b492bf3e1b190f22e09de77713523e345526fd1b01c1186d0fe80d1cf4"]
 ["receipt","q465jpwz8afhe","39218b2b73e853e2e66d8d4ce68cf7e155ca001f05ee4da5942a8d9b63b216bc"]
 ["revocation","pcbhtpwvysgq6","9062e3ab737ecc2e6d487d2076ee27f764be60f06ad01f1ad103d708d466e56a"]
 ["receipt","gx2s84z9jf9xv","5ee8b2827d327a7bbcacb08fd19b9523fad83ebf6c29350d5ce7ca30bf5ce388"]
-["receipt","mg18668nzxvap","4c80506322bfeed5649cfab303959e4ccf0aa0e594995ee6fd5ad59f9d3ee6a7"]
+["receipt","ksx5sc327xp97","1fcf4b960c47ed927b2f9599bc7e54221e35b2e1c001d46d92fc18505f219395"]
 ["receipt","yt70fcc3qm0xb","2ad1c0f63077a03ab1cce01e6235734577d0b072b90ebab2f7db7fd481ccee2c"]
 ["roster","smithlab","782c5e68f4e4f9918e69b7a44b108d9d70c89a289981acff3d25300ec8373c15"]