Release 2.3.0

[HarperZ9]

Version bump for 2.3.0. It ships the browser entry @harperz9/learn/browser and the choice items with named misconceptions from #23.

Changes

• package.json, both package-lock.json fields, src/index.mjs and the two version tests move from 2.2.0 to 2.3.0.
• The README and USAGE install pins and the client-package lines now name 2.3.0.
• The CHANGELOG heading ## Unreleased is now ## 2.3.0, 2026-10-03.
• The client plugin and MCPB manifests read their version from package.json, so they needed no edit.

Checks run locally

• node scripts/check-release.mjs v2.3.0 HarperZ9/learn --notes <file> passes and writes the three 2.3.0 bullets. As a control, v2.2.0 fails with a tag mismatch.
• node --test: 418 pass, 1 skipped, 0 fail. doctor reports every invariant as MATCH, choice_diagnosis_never_reveals_key included.
• python scripts/test_client_plugin.py (7 OK), python scripts/test_release_checksums.py (2 OK), and build_client_plugin.py --mode dev --tag v2.3.0 builds learn-study-2.3.0-dev-source.zip.
• npm pack --dry-run lists src/browser.mjs, src/tutor/session.mjs and src/tutor/choice.mjs, with version 2.3.0 and 69 files.
• I installed the packed tarball into an empty folder. import "@harperz9/learn/browser" resolves through the exports map and gives 23 exports, and a deep src/ import is refused with ERR_PACKAGE_PATH_NOT_EXPORTED. In a vm context with no process, Buffer or require, linking only relative specifiers, the entry links 9 modules, evaluates, and newSession runs.

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