feat: install tools/oracle as the paperspec package

Other repositories (paperstack, then paperpack) import the reference
implementation instead of reimplementing the specification; scienting-core
will take the role later behind the same vectors.

- pyproject.toml: distribution and import name `paperspec`, version 0.1.0,
  Python >= 3.12, no base dependencies; `tools/oracle` is the package, and
  `schemas/`, `sql/` and `vectors/` ship as the data subpackages
  `paperspec.schemas`, `paperspec.sql` and `paperspec.vectors`. Extras
  `schema`, `crypto` and `tools`.
- tools/oracle/__init__.py: the Python 3.14 and cryptography/jsonschema gate
  runs only when imported as `tools.oracle` by the repository's own tools.
- crypto.py imports `cryptography` on first use of HKDF and Ed25519, with an
  ImportError naming `paperspec[crypto]`; schema.py imports `jsonschema` and
  `referencing` in `Store.validator` and `Store.registry`. package.py, db.py
  and receipts.py then import on a bare interpreter.
- pixi.toml installs the package editable (pixi.lock re-solved; no conda pin
  changed), so the tools and the package resolve to the same code.
- tools/README.md names the library surface and the extras; CHANGELOG.md
  records the packaging change under 0.1.0, since check.py requires the
  changelog's first heading to equal the format version.

No computed value, vector, fixture, schema or SQL file changed.

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

CHANGELOG.md

@@ -19,3 +19,12 @@ The first release.
 - Guides for newcomers: an overview, the concepts, a walkthrough of the example paper, runnable examples, the rationale, a FAQ and a glossary.
 - Tools that build and check everything, validate packages and zipped packages and run proposed corrections through the gate, load packages into SQLite or a bundle, and stress the reference implementation with random inputs.
 - A pixi workspace pinned to Python 3.14, with tasks for checking, building, linting, validating and loading.
+
+### 0.1.1
+
+Packaging and lazy imports only; the formats stay at 0.1.0, and no computed value, vector, fixture, schema or SQL file changed.
+
+- `tools/oracle` installs as the Python package `paperspec` (`pyproject.toml`, setuptools), with `schemas/`, `sql/` and `vectors/` as the data subpackages `paperspec.schemas`, `paperspec.sql` and `paperspec.vectors`, so other repositories import the reference implementation instead of reimplementing it.
+- The base package has no dependencies and runs on Python 3.12; the extras `paperspec[schema]` (`jsonschema`, `referencing`), `paperspec[crypto]` (`cryptography`) and `paperspec[tools]` (both) cover `schema` and the HKDF and Ed25519 functions of `crypto`, which now import their packages on first use.
+- The Python 3.14 and package gate in `tools/oracle/__init__.py` runs only when the repository's own tools import it as `tools.oracle`.
+- The pixi workspace installs the package editable, so the tools and the package resolve to the same code.