TechTide Harness Kit v1.0.0

Initial public showcase release for TechTide Harness Kit.\n\nIncludes 487 skills, 348 specialist agents, 114 promoted external research candidates, multi-harness export support, trust metadata, validation scripts, and packaged README assets.\n\nValidation before release:\n- npm run validate\n- npm run test:fuzz\n- npm pack --dry-run --json\n- thk-export-agents CLI smoke checks