Add cognee + flyte sleep/wake memory store tutorial

[AdilFayyaz]

Motivation

Adds a new end-to-end tutorial demonstrating a production-grade sleep/wake memory architecture for AI agents. Showcases flyte.map.aio, flyte.io.Dir, report=True, cache="auto", and flyte.app.AppEnvironment in a realistic multi-session agentic application.

Summary

• memory_store.py — audited, versioned, file-based memory store synced via flyte.io.Dir; prefix-based access control, optimistic concurrency (SHA-256 preconditions), immutable version history, and multi-session isolation under user/sessions/<name>/memories/
• agent.py — staged proposal pipeline: untrusted writes land in staging/sessions/<session>/inbox/, validated against prompt-injection heuristics, then auto-promoted by the sleep cycle
• workflow.py — Flyte tasks: ingest_url (BFS crawl + Cognee graph indexing), consolidate_cluster (parallel Claude memory merges via flyte.map.aio), sleep_cycle (scheduled every 6h), wake_cycle (per-question retrieval with raw-file fallback when Cognee graph is incomplete), summarize_chat_session
• app.py — Streamlit UI served via flyte.app.AppEnvironment; session selector, URL ingestion, inline memory proposal cards (accept/edit/deny), sleep cycle trigger; fixes _configure_cognee_runtime missing from local retrieval path and SearchResult text extraction using str(r) instead of r.search_result

Test Plan

• python v2/tutorials/cognee_memory_store/memory_store.py — built-in self-check (write, concurrency, access control, audit)
• SELF_CHECK=true python v2/tutorials/cognee_memory_store/app.py — app self-check
• uv run v2/tutorials/cognee_memory_store/app.py — deploys to Union; ingest a URL, ask a question, verify ctx_chars > 0 in debug captions (AI_MEMORY_STORE_DEBUG=1)
• Create two sessions, stage a memory in one, trigger sleep cycle, confirm it appears only under user/sessions/<session>/memories/ and not the other
• Check "Topic knowledge base" expander shows all ingested files