Add TypeScript quality feedback skill

[devnexus-automation]

Summary

• project a TypeScript quality feedback skill with Sonar rule playbooks for S3776, S5852, and S4036
• advertise the quality snapshot and quality delta MCP tools through the plugin capability list
• add default worker guidance to compare touched-file quality snapshots and call out serious regressions

Verification

• npm test -- src/devNexusTypeScriptPlugin.test.ts src/typeScriptWorkflowSkills.test.ts src/typeScriptQualityFeedback.test.ts src/typeScriptMcpServer.test.ts
• npm run check
• git diff --check
• TypeScript diagnostics MCP: 0 diagnostics

Closes #26.