ci: publish npm releases

[fbosch]

Summary

• Add a publish-npm job after Release Please creates a GitHub release.
• Mirror the docs-cache release flow: checkout the release tag, install/build, then publish with npm trusted publishing.
• Add workflow_dispatch, concurrency, pinned release-please action, and release outputs needed by the publish job.

Validation

• bunx biome check .github/workflows/release-please.yml was attempted, but Biome ignores workflow YAML in this repo.

Notes

• npm trusted publishing must be configured on npmjs.com for workflow filename release-please.yml.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/opencode-toon-plugin@12

commit: 710c3b2

[chatgpt-codex-connector]

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