chore: update validation processes in documentation and scripts

[bthos]

• Replace npm run build with npm run validate-plugins in CONTRIBUTING.md and README.md to streamline plugin validation steps.
• Clarify that CI will automatically handle registry building and validation upon PR submission.
• Update various scripts and workflows to reflect the new validation commands and improve clarity for contributors.

Co-authored-by: bthos el.mogul@outlook.es
Signed-off-by: bthos el.mogul@outlook.es

Plugin Submission Checklist

• Plugin ID follows format: author.plugin-name or lowercase-with-hyphens
• Manifest passes npm run validate-plugins (or npm run validate-all)
• SHA256 checksum verified (if distribution with checksums is used)
• Plugin tested locally
• README / docs updated if adding new author or changing structure
• License is valid and specified
• No malware or suspicious code

Type of Change

• New plugin
• Plugin update
• Metadata fix
• Documentation
• Other (describe below)

Plugin Details (if applicable)

Plugin ID:
Version:
License:
Repository / Download URL:

DCO

By submitting this pull request, I certify that my contributions are made under the terms of the Developer Certificate of Origin. All commits are signed off with git commit -s.

[Copilot]

Pull request overview

This PR streamlines the plugin validation workflow for contributors by clarifying the separation between local plugin validation and registry building. The changes shift responsibility for building and validating the registry to CI, while contributors only need to run npm run validate-plugins to check their plugin.json files locally.

Changes:

• Modified npm run validate to expect an existing registry.json (no longer builds automatically), and updated npm run validate-all to explicitly include the build step
• Updated documentation (README.md, CONTRIBUTING.md, plugins/README.md) to guide contributors to use npm run validate-plugins instead of npm run validate-all or manual build commands
• Split GitHub workflow steps to clearly separate registry building from validation for better clarity

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
package.json	Separated validate from build; updated validate-all to include explicit build step
README.md	Added notes clarifying that contributors only need validate-plugins; CI handles registry building
CONTRIBUTING.md	Updated validation instructions to recommend validate-plugins; clarified CI responsibilities
plugins/README.md	Updated quick start validation instructions to use validate-plugins
scripts/create-plugin.js	Removed npm run build from next steps; simplified workflow for contributors
.github/workflows/validate-registry.yml	Split "Build and validate registry" into separate steps for clarity
.github/workflows/validate-manifest.yml	Split "Build and validate registry" into separate steps for clarity

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