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/packages/hale2026harmonic.checks-only/MANIFEST.json

@@ -1 +1 @@
-{"doc":"scienting-doc/1","files":[{"path":"assets/586f92512b294a1c325bfc16207771fb9acc7bb67bb206f25a429a055134056f.png","present":false,"sha256":"586f92512b294a1c325bfc16207771fb9acc7bb67bb206f25a429a055134056f","size":18213},{"path":"assets/a18e1eb7f434c85ee180399dc55d2ee78c5ceb915c4a004c5dd0e490399d4c75.png","sha256":"a18e1eb7f434c85ee180399dc55d2ee78c5ceb915c4a004c5dd0e490399d4c75","size":73},{"path":"document.json","sha256":"158e72b3c95617b49b4e0297f01067d8841913349cbe8fc3ec0c35d878b39f4d","size":1018},{"path":"ids.jsonl","sha256":"665b127abf3d7ad20631aa2281d66cea0076cd68e77fc8a5921bc310d295a489","size":852},{"path":"locations.jsonl","sha256":"2c085435b753f9f586d29790d65cc9e61470f0ae661591480f528193dcd91a04","size":7396},{"path":"nodes.jsonl","sha256":"f3464c19215b521c44660d38cd1d9270c740d485eb96af8162922c3e9c41b858","size":41653},{"path":"pages.jsonl","sha256":"948177c6b7e5e361ac1da0ecff6b52406d3513f14d58cd27cd84f17e6f1c054e","size":438},{"path":"provenance.json","sha256":"b1af404b3a07d4b102f0a45237285315dc1ff60f243636c22aef3e1c20b46912","size":224},{"path":"references.jsonl","sha256":"59c7120991928517607521a43a76482370b984c48cf1e74550209dbf607707ef","size":148},{"path":"witnesses.json","sha256":"99ae654df4fb461a424bb51edd476a89041182c7df9c98653a81b78031f92ada","size":1006}],"format":"scienting-package/1","key":"hale2026harmonic"}
+{"doc":"scienting-doc/1","files":[{"path":"assets/586f92512b294a1c325bfc16207771fb9acc7bb67bb206f25a429a055134056f.png","present":false,"sha256":"586f92512b294a1c325bfc16207771fb9acc7bb67bb206f25a429a055134056f","size":18213},{"path":"assets/a18e1eb7f434c85ee180399dc55d2ee78c5ceb915c4a004c5dd0e490399d4c75.png","sha256":"a18e1eb7f434c85ee180399dc55d2ee78c5ceb915c4a004c5dd0e490399d4c75","size":73},{"path":"document.json","sha256":"2ab42740537773f878b406cb0c4ca20e0e39f25a04969bea35f613bd9453dd4b","size":1018},{"path":"ids.jsonl","sha256":"665b127abf3d7ad20631aa2281d66cea0076cd68e77fc8a5921bc310d295a489","size":852},{"path":"locations.jsonl","sha256":"2c085435b753f9f586d29790d65cc9e61470f0ae661591480f528193dcd91a04","size":7396},{"path":"nodes.jsonl","sha256":"cd986490fb92065c3a612ccf6addbce5cdfe56bd4c90628dca97c4c1f920e90c","size":41653},{"path":"pages.jsonl","sha256":"948177c6b7e5e361ac1da0ecff6b52406d3513f14d58cd27cd84f17e6f1c054e","size":438},{"path":"provenance.json","sha256":"4bc7649bf6d3113f6c72b4016713654f57c8f03069632eabd1e6025c05cb9dac","size":226},{"path":"references.jsonl","sha256":"59c7120991928517607521a43a76482370b984c48cf1e74550209dbf607707ef","size":148},{"path":"witnesses.json","sha256":"99ae654df4fb461a424bb51edd476a89041182c7df9c98653a81b78031f92ada","size":1006}],"format":"scienting-package/1","key":"hale2026harmonic"}