chore: drop Changesets for manual changelog + tag flow; rename to @quantecon/lecture-theme

[mmcky]

Addresses #71 (focused scope — see "Out of scope" below).

Completes the Phase 0 decision in PLAN.md to drop Changesets in favour of a curated Keep a Changelog + git tags. Changesets' generated changelog clashed with our hand-curated CHANGELOG.md, and the bot kept regenerating the stale "Version Packages" PR (#69).

What changed

• Remove Changesets wiring
  • Delete .changeset/ (config + the two pending changeset files).
  • Remove the changeset and version npm scripts and the @changesets/cli devDependency.
  • Delete .github/workflows/release.yml (its only job was changesets/action).
  • package-lock.json regenerated — drops the orphaned @changesets/* subtree (2 ins / 563 del). @curvenote/ansi-to-react is an unrelated upstream dep and is untouched.
• Preserve release notes — the two pending changesets (FOUC FOUC: brief flash of unstyled / raw HTML on every page navigation #66, security overrides chore(deps): resolve safe Dependabot advisories via overrides + triage doc #68) are migrated into a curated ## [Unreleased] section in CHANGELOG.md, so nothing is lost when .changeset/ goes away.
• Rename package @curvenote/quantecon-book → @quantecon/lecture-theme (package.json, template/package.json, CHANGELOG.md header). Pure metadata — the theme ships as a GitHub zip + template.yml, not via npm install, and is private. Forward-compatible with a future @quantecon npm org (valid now precisely because it's never published).
• Docs — CONTRIBUTING.md "Releases" now documents the manual bump → changelog → tag flow.

Versioning

Version stays 2.0.0; the migrated entries sit under ## [Unreleased] and get dated/bumped to 2.0.1 when a release is actually cut (decided with maintainer).

Verification

• npm install --package-lock-only — lock diff is only the name change + @changesets/* removal; no unrelated churn.
• npm run compile — typecheck passes (header now reads @quantecon/lecture-theme@2.0.0).
• No @changesets / changeset references remain in package.json, package-lock.json, or .github/.
• Only @curvenote/ansi-to-react (a real dependency) remains under the @curvenote name.

Out of scope (follow-up for the rest of #71)

• The tag-triggered build → zip → GitHub Release pipeline (adapt upstream theme-assets.yml).
• Retiring make deploy, consumer migration (lecture-wasm), archiving the old bundle repo.
• Reserving the @quantecon npm org (separate org-admin task).

After merge

Close the now-obsolete Changesets "Version Packages" PR #69.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR completes the Phase 0 decision to remove Changesets and move to a manual Keep a Changelog + git-tag release flow, while also renaming the package metadata to @quantecon/lecture-theme to match QuantEcon ownership/branding.

Changes:

• Removed Changesets integration (workflow + config files) and stripped changeset/version scripts and @changesets/cli from the Node setup.
• Migrated the two pending Changesets entries into CHANGELOG.md under a curated ## [Unreleased] section.
• Renamed package metadata across package.json, template/package.json, and package-lock.json to @quantecon/lecture-theme, and updated release documentation in CONTRIBUTING.md.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
template/package.json	Renames template package metadata to @quantecon/lecture-theme.
package.json	Removes Changesets scripts/dependency; renames package to @quantecon/lecture-theme.
package-lock.json	Lockfile regenerated to reflect removal of @changesets/* tree and package rename.
CONTRIBUTING.md	Updates release docs to a manual changelog + tag workflow.
CHANGELOG.md	Adds curated ## [Unreleased] section and updates package name in header text.
.github/workflows/release.yml	Removes the Changesets-based release workflow.
.changeset/config.json	Removes Changesets configuration.
.changeset/README.md	Removes Changesets documentation stub.
.changeset/fouc-critical-css.md	Removes pending Changesets entry (migrated to CHANGELOG.md).
.changeset/security-deps-overrides.md	Removes pending Changesets entry (migrated to CHANGELOG.md).

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