[sdk] Add TypeScript SDK — @engram/client

[Malaybhai11]

What

Adds a TypeScript client package (@engram/client) that mirrors the Python engram.sdk API. This lets JS/TS agent stacks (LangChain.js, Vercel AI SDK, custom agents) use Engram for semantic memory without a Python bridge.

What's included

• EngramClient class with ingest, query, get, delete, list, health, isOnline, ingestConversation, ingestEmbedding, and queryByVector methods
• Error hierarchy matching the Python SDK: EngramError, MinerOfflineError, IngestError, QueryError, InvalidCIDError
• TypeScript types for all data structures (QueryResult, HealthResponse, MemoryRecord, Metadata, ClientOptions)
• 9 passing tests (unit tests for client construction, error classes, and offline detection)
• README with usage examples and API reference

Design decisions

• Uses Node.js stdlib (http/https) — zero runtime dependencies
• Namespace auth supports the legacy namespace_key flow (matching the Python SDK fallback)
• CID validation is lenient to avoid breaking on new CID formats
• Timeout handling matches the Python SDK behavior

Verification

cd sdk/typescript
npm install && npm run build && npm test
# 9 tests, 0 failures

Closes #22

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