QVAC-13614 feat: integrate OCR addon with diagnostics contributor pattern

[olyasir]

Summary

• Add _packageName, _packageVersion, and _getDiagnosticsJSON() to ONNXOcr class
• Add @qvac/diagnostics as optional dependency in ocr-onnx/package.json
• Add unit tests (7 tests, 23 assertions) covering diagnostics fields, JSON serialization, state reflection, and round-trip registration

Changes

packages/ocr-onnx/index.js

• Constructor sets this._packageName = '@qvac/ocr-onnx' and this._packageVersion from package.json
• New _getDiagnosticsJSON() method returns { status, params } as JSON string
• Status reflects lifecycle: not_loaded → loaded → destroyed
• BaseInference (from PR QVAC-13562 feat: add @qvac/diagnostics package with BaseInference integration #796) automatically calls this during load()/destroy()

packages/ocr-onnx/package.json

• Added @qvac/diagnostics as optional dependency — zero impact if not installed

packages/ocr-onnx/test/unit/diagnostics.test.js

• Uses stub TestOCR class to test without native bindings
• Round-trip test with @qvac/diagnostics skips gracefully when package unavailable

Test plan

• Unit tests pass locally (npm run test:unit in ocr-onnx)
• CI sanity-checks pass
• CI cpp-lint passes
• All 8 prebuilds pass (linux-x64, linux-arm64, darwin-arm64, win32-x64, android-arm64, ios-arm64, ios-arm64-simulator, ios-x64-simulator)
• All integration tests pass (linux-x64, linux-arm64, darwin-arm64, win32-x64)
• iOS E2E passes
• Android E2E — known flaky, continue-on-error

Depends on: #796 (already merged)
Asana: https://app.asana.com/0/0/1213441152822598

[github-actions]

Tier-based Approval Status

**PR Tier:** TIER1

**Current Status:** ✅ APPROVED

**Requirements:**
- 1 Team Member approval ✅ (2/1)
- 1 Team Lead OR Management approval ✅ (1/1)



---
*This comment is automatically updated when reviews change.*

[olyasir]

/review

[olyasir]

/review