Internal: Add deploy scripts

[KingYes]

✨ PR Description

1. Problem & Context

Adds CI/CD automation for automated releases to WordPress.org with version bumping, changelog validation, and build verification. Enables controlled deployments via workflow dispatch with dry-run support.

2. What Changed (Where)

File	Purpose
scripts/validate-build-files.sh	Verifies plugin structure and version consistency before packaging
scripts/next-version.js	Computes semantic version bumps from package.json
scripts/sync-version.js	Syncs version to plugin headers and readme
scripts/extract-changelog-section.js	Extracts changelog for GitHub releases
scripts/validate-readme-changelog.js	Enforces changelog entry exists with release notes
.github/workflows/release.yml	Main release orchestration workflow
.github/workflows/php-coding-standards.yml	Added workflow_call trigger
.github/workflows/phpunit.yml	Added workflow_call trigger
package.json	New npm scripts for versioning and validation
.build-rsync-exclude	Excludes scripts/ from build package

3. How It Works

Triggered manually from master branch (KingYes/bainternet/arielk only). Runs phpcs/phpunit validation, computes next version, validates changelog exists with entries, bumps package.json/plugin headers, creates git tag, packages plugin, then deploys to WordPress.org. Dry-run mode skips git/WP.org operations for safety testing.

4. Risks

Hardcoded actor allowlist could block future maintainers—consider GitHub team-based auth. Version sync regex assumes specific file formats; fragile if headers change. No rollback mechanism if WP.org deploy fails mid-process.

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