refactor(clipboard-plugin): remove meta from editorjs clipboard payload

[ilyamore88]

Why

The application/x-editor-js clipboard payload carried a meta.version field hardcoded to '3.0.0', alongside a @todo get version info from Core. Nothing reads it — no paste handler exists yet, and a repo-wide grep finds the MIME type only in this plugin and its spec.

Shipping a placeholder version in a public clipboard format is worse than shipping nothing: a future paste handler that trusted the field would branch on a value that never reflected reality. Removing it now, before a consumer exists, costs no migration.

What changed

• application/x-editor-js payload is now { blocks } — meta and its version are gone.
• Deleted the module-private Meta interface and the meta member of ClipboardEditorJSObject.
• #createClipboardObject returns { blocks }; the @todo about sourcing a version from Core is dropped.
• Spec (openspec/specs/clipboard-plugin/spec.md) updated, plus a new scenario pinning that blocks is the payload's only key.

The object wrapper is kept rather than serializing the bare array, so reintroducing a sibling key later stays additive for readers.

Breaking change

The application/x-editor-js clipboard payload no longer includes meta.

No exported TypeScript API changes — ClipboardEditorJSObject and Meta were module-private, so no .d.ts surface moves. The break is on the wire format only, and the value it carried was a placeholder, not a real version.

Verification

• 12/12 tests pass (2 written failing first, per the repo's TDD rule)
• lint:ci clean at --max-warnings 0
• tsc --build clean
• Stryker: 100% mutation score (break threshold 75), 0 survivors

Notes

Planned via OpenSpec; artifacts archived under openspec/changes/archive/2026-07-21-remove-clipboard-payload-meta/.

One thing worth a look: openspec archive rewrote openspec/specs/clipboard-plugin/spec.md and, as collateral, stripped blank lines around ## Requirements and dropped the trailing Implemented in `src/index.ts`... footer. That footer is a convention in every spec file under openspec/specs/, so I restored it — the spec diff here reflects only the intended payload change. May be worth filing against the archive tool separately.

🤖 Generated with Claude Code

[github-actions]

Unit Tests

Package	Coverage	Delta
@editorjs/clipboard-plugin	66.66%	0% ⚪️

Mutation Tests

Package	Mutation score	Dashboard URL
@editorjs/clipboard-plugin	100.00% 🟢	Dashboard

[Copilot]

Pull request overview

This PR simplifies the ClipboardPlugin’s custom clipboard wire format by removing the placeholder meta.version from the application/x-editor-js payload, keeping the payload as an object wrapper containing only { blocks } and aligning tests/specs accordingly.

Changes:

• Remove meta/version from the application/x-editor-js clipboard payload (now { blocks } only).
• Update clipboard plugin tests to match and add a scenario asserting blocks is the only key.
• Update the OpenSpec clipboard-plugin spec and archive the corresponding OpenSpec change artifacts.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/plugins/clipboard-plugin/src/index.ts	Removes meta from the clipboard payload and simplifies the payload factory to return { blocks }.
packages/plugins/clipboard-plugin/src/index.spec.ts	Updates payload expectations and adds a test asserting no meta key is present.
openspec/specs/clipboard-plugin/spec.md	Updates the documented payload shape and adds a scenario explicitly requiring blocks to be the only key.
openspec/changes/archive/2026-07-21-remove-clipboard-payload-meta/tasks.md	Archives the implementation/testing task plan for the change.
openspec/changes/archive/2026-07-21-remove-clipboard-payload-meta/specs/clipboard-plugin/spec.md	Archives the delta spec reflecting the updated payload requirements.
openspec/changes/archive/2026-07-21-remove-clipboard-payload-meta/proposal.md	Archives the change proposal describing the wire-format breaking change.
openspec/changes/archive/2026-07-21-remove-clipboard-payload-meta/design.md	Archives the design rationale and tradeoffs for removing meta.
openspec/changes/archive/2026-07-21-remove-clipboard-payload-meta/.openspec.yaml	Adds archive metadata for the OpenSpec change.

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