feat(memory): connect graph query and doc ingest APIs

[sanil-23]

Summary

• Wire up memory.graph.query RPC endpoint (Rust dispatch + frontend wrapper) to load graph relations from the local store
• Add memory.doc.ingest RPC endpoint and frontend memoryDocIngest() wrapper for triggering document ingestion from the UI
• Integrate graph relations into MemoryWorkspace: display relation triples (subject → predicate → object), compute entity nodes from local graph data with fallback to backend API counts

Problem

• The frontend MemoryWorkspace had no way to query the local semantic graph or trigger document ingestion via RPC
• Entity counts in the intelligence view relied solely on backend API responses with no local graph awareness
• No UI surface existed to visualize graph relations (subject → predicate → object triples)

Solution

• Rust backend: Added IngestDocParams struct and doc_ingest() handler in ops.rs, routed memory.doc.ingest in dispatch.rs
• Frontend wrappers: Added GraphRelation type, memoryGraphQuery(), and memoryDocIngest() in tauriCommands.ts
• UI integration: MemoryWorkspace.tsx now loads graph relations on workspace init, computes entity nodes from local relations (with fallback to backend counts), and renders a scrollable relations panel showing up to 20 triples with evidence counts

File	What
src/openhuman/memory/ops.rs	IngestDocParams struct + doc_ingest() handler
src/rpc/dispatch.rs	Route memory.doc.ingest to handler
app/src/utils/tauriCommands.ts	GraphRelation type, memoryGraphQuery(), memoryDocIngest()
app/src/components/intelligence/MemoryWorkspace.tsx	Graph relations loading, entity computation, relations UI

Submission Checklist

• Unit tests — Pending: Rust unit tests for doc_ingest handler, Vitest tests for MemoryWorkspace graph relations rendering
• E2E / integration — Pending: JSON-RPC E2E test for memory.doc.ingest and memory.graph.query methods
• Doc comments — IngestDocParams and doc_ingest() follow existing crate conventions; GraphRelation type is self-documenting
• Inline comments — Entity node computation fallback logic is documented in-line

Impact

• Desktop only — all changes go through Tauri core_rpc_relay; no mobile/web impact
• No breaking changes — new RPC methods are additive; existing MemoryWorkspace behavior preserved via fallback path
• Performance — graph query is fire-and-forget on workspace load; no blocking impact on initial render

Related

• Issue(s): Part of Fix Memory Module Integration in Rust #69
• Follow-up PR(s)/TODOs:
  • Add unit + E2E test coverage for new RPC methods
  • Add UI controls for triggering memoryDocIngest from the workspace

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