Clean up OpenAPI parse boundaries

[RhysSullivan]

Summary

• parse JSON OpenAPI specs with Effect Schema boundaries
• normalize YAML parse results through the same object schema boundary
• replace raw parse/fetch cause text with stable OpenApiParseError messages
• add focused Effect Vitest coverage for JSON, YAML, empty input, and non-object input

Verification

• bunx oxlint -c .oxlintrc.jsonc packages/plugins/openapi/src/sdk/parse.ts packages/plugins/openapi/src/sdk/parse.test.ts --format json
• bun run typecheck (packages/plugins/openapi)
• bunx vitest run src/sdk/parse.test.ts

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commit: 74c0739

[RhysSullivan]

Closing as superseded by focused PRs: #647 covers the parser boundary implementation, and #686 preserves the parse tests as a stacked follow-up on that parser PR.