feat: minted keys, VRF seeds, RFC 9162 proofs, history roots, tag URIs and a transparency log

Keys (spec/02 §2.4), the rule paperstack settled on:
- A work key is a Scholar-style citation key, a hyphen and the first four
  Crockford base32 characters of SHA-256("scienting-key/1:" + identity),
  where the identity is the first of doi, arxiv, isbn, pmid, pmcid and
  openalex in same_as, else the folded title, year and family name. A
  collision lengthens the later key by two characters; a key is minted
  once and never recomputed. A document key adds .si, .v<seq> or .<type>
  for versions other than the version of record.
- Every fixture key is now minted (hale2026harmonic-damb,
  okafor2025solvent-acth, writer2027fixed-ynr7.v3, tiny2026tiny-j4qm), so
  every node and record ID was re-minted and the docs rewritten to match.
  The validator checks the document key against the work key and version
  (doc.key.work) and the hash part against the identifier (doc.key.suffix).
  vectors/keys.jsonl pins the cases paperstack's tests pin.

Review:
- Spot-check seeds are ECVRF-EDWARDS25519-SHA512-TAI proofs (RFC 9381),
  implemented in tools/oracle/vrf.py in plain Python and reproduced
  against the RFC's Example 16; the sample ranks by the VRF output. The
  earlier Ed25519 seed could be ground by a dishonest checker.
- RFC 9162 inclusion and consistency proofs (crypto.inclusion_path,
  verify_inclusion, consistency_proof, verify_consistency) with
  scienting-proof/1, vectors/proofs.jsonl and two fixture records.
- document.json carries `history`, the root over the corrections, with
  the empty-tree hash for none (spec/11 §11.5, rule doc.history).
- A provisional transparency log (spec/23): log entries, signed-note
  checkpoints with key hashes as transparency logs share them, the rule
  that a logged revocation beats a self-asserted time, and vectors.
- Reserved signature schemes cose and ml-dsa-65 (spec/08 §8.4).

Identifiers and text:
- urn:scienting: becomes tag:scient.ing,2026: (RFC 4151), since the URN
  namespace was never registered.
- Unicode 16.0 is pinned for normalization and categories (spec/01 §1.4);
  the checker refuses another version.

Checking:
- check.py: keys, proofs, VRF and checkpoint vectors; the proof and
  checkpoint records; a check that every ID and hash the prose quotes
  exists in the fixtures or vectors; three more broken packages
  (history-wrong, key-suffix, key-work).
- stress.py: key, VRF, proof and checkpoint properties.
- Docs: a keys section in the concepts and FAQ, rationale entries for
  keys, VRF, proofs, tag URIs and the Unicode pin, a "Looking ahead"
  section, media-type registration and OCI distribution notes.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

vectors/addresses.jsonl

@@ -1,14 +1,17 @@
-{"address":"cornell1995second#k3m9q2a","id":"plain","parsed":{"key":"cornell1995second","node":"k3m9q2a","pin":null,"span":null,"store":null}}
-{"address":"cornell1995second#k3m9q2a@4f1a0c","id":"pinned","parsed":{"key":"cornell1995second","node":"k3m9q2a","pin":"4f1a0c","span":null,"store":null}}
-{"address":"cornell1995second#k3m9q2a@4f1a0c[12:57]","id":"span","parsed":{"key":"cornell1995second","node":"k3m9q2a","pin":"4f1a0c","span":[12,57],"store":null}}
-{"address":"smithlab/cornell1995second#k3m9q2a","id":"store","parsed":{"key":"cornell1995second","node":"k3m9q2a","pin":null,"span":null,"store":"smithlab"}}
-{"address":"dong2026machine.v2#k3m9q2a[0:0]","id":"span-no-pin","parsed":{"key":"dong2026machine.v2","node":"k3m9q2a","pin":null,"span":[0,0],"store":null}}
-{"address":"cornell1995second.si#m2x8p4d","id":"si","parsed":{"key":"cornell1995second.si","node":"m2x8p4d","pin":null,"span":null,"store":null}}
-{"address":"cornell1995second#b-p03-text-004","id":"alias","parsed":{"key":"cornell1995second","node":"b-p03-text-004","pin":null,"span":null,"store":null}}
-{"address":"cornell1995second#k3m9q2a[57:12]","id":"bad-reversed","parsed":null}
-{"address":"cornell1995second#k3m9q2a@4F1A0C","id":"bad-pin","parsed":null}
-{"address":"k#k3m9q2a[01:2]","id":"bad-leading-zero","parsed":null}
-{"address":"cornell1995second#","id":"bad-no-node","parsed":null}
-{"address":"Cornell1995#k3m9q2a","id":"bad-upper-key","parsed":null}
-{"address":"a/b/c#k3m9q2a","id":"bad-two-stores","parsed":null}
-{"address":"k#k3m9q2a@4f1a","id":"bad-pin-length","parsed":null}
+{"address":"cornell1995second-saqk#k3m9q2a","id":"plain","parsed":{"key":"cornell1995second-saqk","node":"k3m9q2a","pin":null,"span":null,"store":null}}
+{"address":"cornell1995second-saqk#k3m9q2a@4f1a0c","id":"pinned","parsed":{"key":"cornell1995second-saqk","node":"k3m9q2a","pin":"4f1a0c","span":null,"store":null}}
+{"address":"cornell1995second-saqk#k3m9q2a@4f1a0c[12:57]","id":"span","parsed":{"key":"cornell1995second-saqk","node":"k3m9q2a","pin":"4f1a0c","span":[12,57],"store":null}}
+{"address":"smithlab/cornell1995second-saqk#k3m9q2a","id":"store","parsed":{"key":"cornell1995second-saqk","node":"k3m9q2a","pin":null,"span":null,"store":"smithlab"}}
+{"address":"dong2026machine-1ard.v2#k3m9q2a[0:0]","id":"span-no-pin","parsed":{"key":"dong2026machine-1ard.v2","node":"k3m9q2a","pin":null,"span":[0,0],"store":null}}
+{"address":"cornell1995second-saqk.si#m2x8p4d","id":"si","parsed":{"key":"cornell1995second-saqk.si","node":"m2x8p4d","pin":null,"span":null,"store":null}}
+{"address":"cornell1995second-saqk#b-p03-text-004","id":"alias","parsed":{"key":"cornell1995second-saqk","node":"b-p03-text-004","pin":null,"span":null,"store":null}}
+{"address":"cornell1995second-saqk#k3m9q2a[57:12]","id":"bad-reversed","parsed":null}
+{"address":"cornell1995second-saqk#k3m9q2a@4F1A0C","id":"bad-pin","parsed":null}
+{"address":"k-0000#k3m9q2a[01:2]","id":"bad-leading-zero","parsed":null}
+{"address":"cornell1995second-saqk#","id":"bad-no-node","parsed":null}
+{"address":"Cornell1995-k3f9#k3m9q2a","id":"bad-upper-key","parsed":null}
+{"address":"a/b/c-0000#k3m9q2a","id":"bad-two-stores","parsed":null}
+{"address":"k-0000#k3m9q2a@4f1a","id":"bad-pin-length","parsed":null}
+{"address":"cornell1995second#k3m9q2a","id":"bad-no-hash","parsed":null}
+{"address":"cornell1995second-k3fi#k3m9q2a","id":"bad-hash-alphabet","parsed":null}
+{"address":"cornell1995second-k3f#k3m9q2a","id":"bad-short-hash","parsed":null}