chore: prepare 0.27.9-next.6 release

[mohanagy]

Summary

• bump package metadata to 0.27.9-next.6
• add changelog and README highlights for the Windows cmd.exe compare fix
• sync the MCP registry manifest for the next prerelease

Testing

• npm run release:verify
• npm run registry:validate
• npm run typecheck
• npm run build
• CI=1 npm run test:run
• npm pack --dry-run
• npm sbom --sbom-format cyclonedx > sbom.cdx.json

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 67424977-5a0d-402d-8d76-61395626de59

📥 Commits

Reviewing files that changed from the base of the PR and between bb2a29a and 898fcc3.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (4)

• CHANGELOG.md
• README.md
• docs/mcp-registry/server.json
• package.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/release-0.27.9-next.6

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[mohanagy]

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