feat: rename to paperspec and add the website

- Rename manuspec to paperspec everywhere outside pixi.toml: prose, the
  tools, provenance tool names and the fixture key derivations, so every
  fixture and vector is rebuilt.
- Move the namespace addresses under the site, mirroring the repository:
  schema $id https://paperspec.scient.ing/schemas/<file>, the JSON-LD
  context https://paperspec.scient.ing/context/scienting-1.jsonld, and
  term IRIs https://paperspec.scient.ing/vocab#<term>. Format
  identifiers (scienting-*) and URNs (urn:scienting:) are unchanged.
- tools/site.py (standard library only) builds _site/: every file of the
  repository at its own path, each Markdown file rendered as a page with
  sidebar navigation, heading anchors matching the forge's, folder
  listings, a vocabulary page for the context's IRIs, a heading search
  and a 404 page; light and dark themes.
- check.py builds the site and checks that every Markdown file has a
  page, every internal link and fragment resolves, no Markdown is left
  unrendered, and every $id, the context address and the vocabulary IRIs
  are files of the site.
- deploy/: a Caddyfile with the media types and CORS the data needs, and
  a guide; .gitea/workflows/site.yml builds on main and publishes with
  rsync when the SITE_* secrets are set.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

fixtures/records/layer/receipt.json

@@ -1 +1 @@
-{"at":"2026-10-11T19:30:00Z","by":"ana","doc":"hale2026harmonic","evidence":[],"format":"scienting-receipt/1","id":"q1mqaaps430at","level":"F3","nodes":[],"records":[["annotation","dz7b0r84n38wp","f7a5af8530468fe4dc54dcca3f2f0cfbfe69db1a77855febdd1a2f3c69d46cfa"],["annotation","h6s98vg6qcyjp","3cbe10d4ecdff3089a25f1b5ca5061e02201243e1bc4ccbe68a92e34a6b18b56"],["annotation","x0abag88jjq4t","7cbc20c779f95e25b2342a316ddf68750110782c0894e00d50dc3073ed5c980e"],["annotation","xbwf8p70398mp","1b0581890cdc337c30feb66baa7691ef2a599888b3df3c348d750e4072dbabd5"],["annotation","y228zv031s285","0eccd844df132a805887437e555e05428424fafa9eb3b2644a7f49a096442a09"]],"rev":12,"root":"72e9d4780a5d61c54e54933e4c576d69f3f079de9901526554a2d381845e437c","scope":"targeted:layer","signature":{"key":"ana","scheme":"ed25519","value":"+foYjFFLJQDJe5a58u8eIEU9e8OCHa2YwOT2xxcwCOUhTXXIPbYGL3GrFhzi5XeftXab7AoKzs4jVNQcSrW4Bw=="}}
+{"at":"2026-10-11T19:30:00Z","by":"ana","doc":"hale2026harmonic","evidence":[],"format":"scienting-receipt/1","id":"pgtc2enctchze","level":"F3","nodes":[],"records":[["annotation","c9herrt41fcpr","4c25a14e30ef552a5993aeed3a818db3f67bb5e6422ce27c110862d485664fbd"],["annotation","jgk1n6dcvwbvw","2bc845ce83be9f19580310fbc974fc4b916ea75933996096c7bb72d5c76a44cb"],["annotation","shn6geqn0rhvs","9af1f3a2d2a97ce871337d87a397746b3010a2391917053deb3162e7533baf01"],["annotation","tj573y8mhap0f","0e70a9b6a05e16dc6c55ac27c963ae1820d39387521dd2ee1d0e77be683b85a5"],["annotation","v5pk0zcbsxa4b","78873fd145b89faa9bcda800fce9d0f5a057ce10fc0f94d95141d3d9fba85636"]],"rev":12,"root":"1d172f9491c225044a3b9bf42c2c4524a24e587562fa455941d80221b425d02e","scope":"targeted:layer","signature":{"key":"ana","scheme":"ed25519","value":"fEH0tDCkbVeRsjBgKS+ZphoZYaltQ0l53XgWrH/aWCOnl0P4diRFzcj1rheqW7Tck+gSmlLl0xtLmYDtjCPaAw=="}}