feat(#16): uteke-core HTTP integration — semantic search + auto-linking

[ajianaz]

Phase 2 Foundation — Uteke Server Integration

Implements #16 — replaces direct SQLite reads with HTTP API calls to uteke-serve for semantic search, cosine auto-linking, and graph data.

Architecture

CorIn (Svelte 5)
  └── Tauri IPC
       ├── Rust Commands
       │    ├── Direct DB (rusqlite) — fallback, Phase 1 mode
       │    └── UtekeClient (HTTP) — semantic search, auto-link ← NEW
       └── Uteke DB: ~/.uteke/uteke.db (read-only)

What's New

Backend:

• uteke_client.rs — HTTP client with 15+ API methods (recall, search, remember, graph, rooms, etc.)
• 6 new Tauri commands: uteke_server_status, uteke_recall, uteke_remember, uteke_forget, uteke_server_graph, uteke_server_stats
• resolve_model_dir() — reuse ~/.uteke/models/ if Uteke installed, fallback to ~/.codecora/uteke/models/

Frontend:

• utekeServer IPC wrappers in ipc.ts
• Dashboard: server status badge (green pulse = online, hint = offline)
• MemoryList: semantic search with fallback to FTS5
• Settings: Uteke server connection panel with live stats

Security (Cora Review Fixed)

• Clone UtekeClient outside mutex lock (no held lock during HTTP)
• URL-encode query params via .query() (no string interpolation)
• Check HTTP status on all endpoints (no silent failures)

Model Path Resolution

1. ~/.uteke/models/embeddinggemma-q4/ — reuse Uteke (no dup download)
2. ~/.codecora/uteke/models/embeddinggemma-q4/ — standalone copy

Testing

• ✅ Rust: clippy + fmt + 9 tests pass
• ✅ Frontend: svelte-check clean, vite build pass
• ✅ Cora review: no issues found

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