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>

vectors/README.md

@@ -84,7 +84,7 @@ The reference checker in [tools/](../tools/README.md) runs all twenty files, tog
 python3 tools/check.py --quick
 ```
 
-It needs Python 3.10 or later and has no option to run one file.
+It needs Python 3.14 and two packages, `jsonschema` and `cryptography`, and has no option to run one file.
 It tests the reference implementation in `tools/oracle/` against the vectors.
 It does not test yours.
 
@@ -161,4 +161,4 @@ Canonical JSON is RFC 8785 with added rules.
 Receipts use a Merkle tree that follows RFC 6962 ([8.5](../spec/08-fidelity.md#85-merkle-roots)); RFC 9162 replaces RFC 6962 and defines the same tree.
 The `node_hash` of a node is a different construction: a hash of the canonical JSON of `{own, children}`.
 Here `own` is the node's own hash and `children` holds the `node_hash` of each child ([5.1](../spec/05-hashes.md#51-the-five-values)), and `hashes.jsonl` pins it.
-The comparison page covers how these formats differ from JATS (Journal Article Tag Suite), TEI (Text Encoding Initiative), W3C (World Wide Web Consortium) Web Annotation and the other neighbors [CHECK: docs/comparison.md does not exist in the reference repository; link it once it does].
+The [comparison page](../docs/comparison.md) covers how these formats differ from JATS (Journal Article Tag Suite), TEI (Text Encoding Initiative), W3C (World Wide Web Consortium) Web Annotation and the other neighbors.