chore(deps): migrate to @changesets/cli v3 with the config its defaults require

.changeset/changesets-cli-v3-migration-5296.md

@@ -0,0 +1,31 @@
+---
+---
+
+Release-tooling only, no published package changes (objectui#5296).
+
+`@changesets/cli` moves from `^2.31.1` to `^3.0.0`, together with the
+`.changeset/config.json` changes v3's defaults require — the two halves are
+broken apart, and each half is broken silently until the next release, so they
+land in one commit.
+
+- `privatePackages` is now declared explicitly as `{ "version": true,
+ "tag": false }`. Omitting it used to mean exactly that under v2 and means
+ `{ "version": false, "tag": false }` under v3, and `version: false` marks
+ private packages *ignored* rather than merely unbumped. This repo keeps one
+ private package inside the `fixed` group — `object-ui`
+ (`packages/vscode-extension`), which ships to the VS Code marketplace instead
+ of npm — and one pending changeset names it beside four published packages,
+ which under the new default makes the release plan a rejected "mixed
+ changeset". Measured: `changeset status` and `changeset version` both exit 1
+ on the bump alone, and green PR CI cannot see it, because no PR workflow runs
+ either command.
+- `___experimentalUnsafeOptions_WILL_CHANGE_IN_PATCH.onlyUpdatePeerDependentsWhenOutOfRange`
+ is removed. `@changesets/assemble-release-plan@6` reads it in six places and
+ `@7` in none, so it is load-bearing under v2 and inert under v3 — removable
+ only in the commit that lands the bump.
+- `$schema` moves from `@changesets/config@3.1.2` to `@changesets/config@4.0.0`.
+- `scripts/check-changeset-fixed.mjs` gains the two rules that make the above
+ mechanical: `privatePackages` must be declared, and a private package in the
+ `fixed` group must not be paired with `version: false`. Rehearsed against the
+ real pending stock in a throwaway clone; the v3 release plan is identical to
+ the v2 one, package for package.

.changeset/config.json

@@ -1,5 +1,5 @@
 {
- "$schema": "https://unpkg.com/@changesets/config@3.1.2/schema.json",
+ "$schema": "https://unpkg.com/@changesets/config@4.0.0/schema.json",
  "changelog": "@changesets/cli/changelog",
  "commit": false,
  "fixed": [
@@ -53,7 +53,8 @@
  "@object-ui/site",
  "@object-ui/test-support"
  ],
- "___experimentalUnsafeOptions_WILL_CHANGE_IN_PATCH": {
- "onlyUpdatePeerDependentsWhenOutOfRange": true
+ "privatePackages": {
+ "version": true,
+ "tag": false
  }
 }

package.json

@@ -80,7 +80,7 @@
  "test:e2e:import-console": "playwright test --config=playwright.import-console.config.ts"
  },
  "devDependencies": {
- "@changesets/cli": "^2.31.1",
+ "@changesets/cli": "^3.0.0",
  "@eslint/js": "^10.0.1",
  "@objectstack/spec": "^17.0.0",
  "@playwright/test": "^1.62.1",