Antigravity 541e9e1fb5 feat(ai-ux): deduplicate AI queries, handle ServiceUnavailable retries, and optimize reader canvas graph prerendering (#44)
This Pull Request encapsulates all outstanding AI, Blazor InteractiveAuto lifecycle, pgvector, and Firefox authorization/session compatibility fixes.

### Key Accomplishments:
1. **Concurrent Request Deduplication (Option B):** Implemented a thread-safe active task registry in `KnowledgeService` that groups concurrent graph extraction queries for the same content, preventing duplicate AI calls completely.
2. **Resilience Strategy for Downstream Demands:** Extended the `ai-retry` resilience pipeline to automatically intercept and retry on temporary Google API `503 ServiceUnavailable` / `high demand` spikes.
3. **Interactive Graph Generation Guard (Option A):** Prevented server-side prerender-phase graph requests in the reader canvas component.
4. **Firefox Compatibility & Cookie Handler:** Implemented an authentication endpoint and hybrid hidden-form submission flow to solve login, registration, and logout redirections and cookies securely.
5. **Autoscrolling & Graph Exclusions:** Added concept-to-block smooth scrolling, active block badging, and filtered out markdown code blocks from being extracted as nodes.

All unit tests compiled and passed 100% cleanly.

---------

Co-authored-by: Marek Jasiński <jasins.marek@gmail.com>
Reviewed-on: #44
Co-authored-by: Antigravity <antigravity@google.com>
Co-committed-by: Antigravity <antigravity@google.com>
2026-05-18 17:53:36 +00:00

📖 Nexus Reader

Nexus Reader is a state-of-the-art, cross-platform Blazor .NET 10 immersive e-book reader, powered by Native AOT, Clean Architecture, CQRS, and interactive D3.js Relationship Graphs built on vector-based AI semantics.


Features & Architecture Highlights

📁 Ingestion & Description persistence

  • Extracted and persistent book descriptions from EPUB package metadata during book ingestion.
  • The Description field propagates cleanly from the Ebook entity through Mapster to LastReadBookDto and UserProfileDto.
  • Implemented deep-link route activation: /reader/{bookId}?chapter=N.
  • Allows instant resume of reading session coordinates and loads the specific chapter chapter directly via URL query parameters.

🛡️ Downstream AI Resilience

  • Standard resilience engine in DependencyInjection.cs utilizing the Polly package (ai-retry).
  • Automatically intercepts, handles, and retries on both rate-limits (429 Too Many Requests) and downstream capacity overloads (503 ServiceUnavailable / high demand).

⚙️ Concurrent Request Deduplication

  • Multi-client InteractiveAuto Blazor circuit synchronization is backed by a thread-safe active task registry in KnowledgeService which ensures that identical concurrent requests await a single shared task instance, eliminating redundant LLM queries.

🛠️ Build & Verification Gate

Ensure the dotnet workload matches the active SDK, and compile the full solution utilizing:

dotnet build NexusReader.slnx --no-restore

Run test suite:

dotnet test --no-restore
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