feat: validator, bundle builder and release checks for 0.1.0

- Add tools/validate.py: validates packages, and with --correction runs
  proposed corrections through the gate against a package without
  writing anything (spec/11 §11.4). The gate now refuses a proposal that
  fails the correction schema, rule correction.schema.
- tools/load.py validates every package before loading, and with
  --bundle --built-from builds a scienting-bundle/1 with the FTS5 search
  index and bundle_meta (spec/13 §13.5). Search rows are defined per
  unit (sentence, cell, equation outside a sentence, figure-text) with
  the parent kind as context.
- Roster keys carry a role, and a key with the role owner may revoke any
  receipt (spec/08 §8.7, spec/20); roster schema, store table and the
  fixture roster updated. The checker signs a trial revocation to prove
  the rule both ways.
- A qa: receipt raises the nodes it sampled except those in its errors
  (spec/08 §8.2); the example paper's fidelity counts become 27 F3,
  13 F2, 4 F1 and 1 F0.
- The destination chooses the keyed scheme, not the text policy:
  hmac-team between the team's machines, hkdf-pages outside the team
  (spec/05 §5.8, spec/12 §12.5).
- A TextQuoteSelector must repeat the anchor's plain quote and is absent
  for hashed or keyed anchors (spec/18 §18.3).
- Add fixtures/records/suspect.json, a scienting-suspect/1 record.
- Oracle: hashes are kept incrementally and checked after every
  correction against a full recomputation; load and write refuse unsafe
  manifest paths; Ed25519, HKDF and schema validation come from the
  cryptography and jsonschema packages; canonical JSON uses the built-in
  encoder with an exact RFC 8785 fallback.
- The tools need Python 3.14 with cryptography and jsonschema; the py310
  CI environment is dropped and the workflow runs the default only.
- Resolve every [CHECK] note in the docs, READMEs and context; add
  CONTRIBUTING.md; every tool answers --help and refuses unknown options.

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

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

@@ -1 +1 @@
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fixtures/packages/hale2026harmonic.checks-only/document.json

@@ -1 +1 @@
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+{"counts":{"leaves":45,"nodes":75},"fidelity":{"counts":{"F0":1,"F1":4,"F2":13,"F3":27},"lowest":"F0"},"format":"scienting-doc/1","hashing":{"key_id":"ba87f5b02064d529","scheme":"hmac-team"},"key":"hale2026harmonic","kind":"article","language":"en","license":{"text":"All rights reserved by the publisher (fictional)."},"meta":{"DOI":"10.5555/example.hale.2026","author":[{"family":"Hale","given":"R."},{"family":"Osei","given":"M."}],"container-title":"Journal of Example Chemistry","issued":{"date-parts":[[2026,3,2]]},"page":"101-109","title":"Harmonic bond parameters for small organic molecules from a two-step fit","type":"article-journal","volume":"14"},"meta_hash":"831ac4c47c87df2bc0d761e169f3aefb3b2e64404a2d2b157a692262a956301f","policy":"checks-only","relations":[],"rev":12,"root":"1fd39f356fbbdbe306b68ed01d71ce1acf9a46310658f430b0e6c5581f5fce6b","store":"smithlab","version":{"date":"2026-03-02","type":"version-of-record"},"work":{"key":"hale2026harmonic","same_as":["doi:10.5555/example.hale.2026"]}}