feat: implement TypeScript SDK remote client

[atharvmantri]

Summary

• replace the TypeScript SDK's explicit remote-method TODO stubs with a fetch-based REST client
• serialize camelCase requests and deserialize snake_case responses, accepting common response envelopes
• send optional bearer auth, URL-encode memory IDs, support 204 deletes, and expose structured MemoryGuardError payloads
• add deterministic injected-fetch coverage for every SDK endpoint and error behavior

Validation

• pnpm --filter @memoryguard/sdk test (13 passed)
• pnpm --filter @memoryguard/sdk build
• pnpm test (SDK 13, dashboard 55, landing test)
• pnpm build (SDK, dashboard, landing)
• git diff --check

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