docs: add openapi examples for spike route

[Tobiloba0]

Closes #911

Summary

• Add request/response examples for the public /api/spike timeout probe
• Document spike record create, list, update, and delete examples
• Add Spike OpenAPI component schemas and a focused YAML contract test

Testing

• git diff --check
• node -e "...OpenAPI spike examples smoke check..."

Notes

• npm test -- --runInBand src/routes/spike.openapi.test.ts was blocked by the existing error-codes:check failure before Jest started.
• Direct npx jest/npx eslint could not run because dependencies were not installed; npm ci timed out before local binaries were available.

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[greatest0fallt1me]

Great work, this looks good. Thanks for the contribution!