chore(release): 0.18.1

[jkmassel]

What?

Bumps 0.18.0 → 0.18.1 to cut a patch release that ships #551 — version bump only, no other changes.

Why?

v0.18.0 predates #551, which stamps CFBundleShortVersionString and MinimumOSVersion into the GutenbergKitResources.framework Info.plist. Without those keys, apps embedding GutenbergKit fail to upload to TestFlight (altool 90057 / 90360). The fix is on trunk but unreleased, so no SPM consumer can pin a tag that contains it. This is the bump that lets us tag v0.18.1.

How?

npm --no-git-tag-version version patch + npm run generate-version — four files, version fields only:

• package.json / package-lock.json → 0.18.1
• ios/Sources/GutenbergKit/Sources/GutenbergKitVersion.swift → version = "0.18.1" — compiled into the GutenbergKit library from source (even in .release mode), so it has to be committed at the tagged commit
• android/.../GutenbergKitVersion.kt → VERSION = "0.18.1"

No rebuilt web bundle, unlike the 0.18.0 bump. The CI Build XCFramework step downloads a freshly-built dist/ and copy-dist-ios overwrites the committed Gutenberg/ bundle before packaging — "ship the just-built dist rather than whatever was committed at HEAD" (Makefile) — and build_xcframework.sh stamps the framework version from package.json. So the committed bundle isn't load-bearing for the tag, and it's byte-identical to v0.18.0 regardless (#551 only touched build_xcframework.sh). Trunk stays resourcesMode = .local; its committed bundle keeps reporting 0.18.0 in JS error metadata until the next full build — cosmetic, trunk-only, invisible to tag consumers.

Testing Instructions

Publish is the manual Buildkite flow (docs/releases.md), pinned to this PR's merge commit:

• Merge to trunk
• Trigger automattic/gutenbergkit → Branch trunk, Commit = merge SHA, NEW_VERSION=v0.18.1
• Validate Swift release passes (no pre-existing tag/Release)
• v0.18.1 tag + GitHub Release published, XCFramework on CDN
• Downstream app embedding v0.18.1 uploads to TestFlight cleanly (verifies the 90057/90360 regression is gone)

Related: #551

[wpmobilebot]

XCFramework Build

This PR's XCFramework is available for testing. Add the following to your Package.swift:

.package(url: "https://github.com/wordpress-mobile/GutenbergKit", branch: "pr-build/556")

_{Built from fb2e06f}

[crazytonyli]

I'll merge this PR and release the version.