v3.5.0 — Pluggable Backend API (Phase 5 Part 2)

[Jovancoding]

v3.5.0 — Pluggable Backend API (Phase 5 Part 2)

Body:

## What's New

### Pluggable Backend API

Every named blackboard can now use a custom storage backend — file system, in-memory, Redis, CRDT, cloud KV, or anything you implement.

```ts
import { MemoryBackend, FileBackend } from 'network-ai';
import type { BlackboardBackend } from 'network-ai';

// Ephemeral board — no disk writes
const tmp = orchestrator.getBlackboard('cache', { backend: new MemoryBackend() });

// Explicit file backend
const persistent = orchestrator.getBlackboard('reports', { backend: new FileBackend('./data/reports') });

// Custom backend (Redis, CRDT, cloud KV, etc.)
class RedisBackend implements BlackboardBackend { ... }
const prod = orchestrator.getBlackboard('prod', { backend: new RedisBackend(client) });

New exports

Export	Description
BlackboardBackend	Interface — implement to plug in any storage layer
MemoryBackend	Pure in-memory, zero disk I/O; clear() and size() helpers included
FileBackend	Wraps LockedBlackboard; atomic file-locked writes; the default when no backend is specified

NamedBlackboardOptions.backend?

Pass any BlackboardBackend to getBlackboard(name, { backend }). Omitting it continues to use FileBackend — 100% backward compatible.

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Test coverage

552 tests passing across 7 suites:

Suite	Tests
test-standalone.ts	79
test-phase4.ts	147
test-adapters.ts	139
test-priority.ts	64
test-security.ts	33
test-phase5.ts	35
test-phase5b.ts (new)	55

Demos verified

• 01-hello-swarm.ts ✅
• 02-fsm-pipeline.ts ✅
• 03-parallel-agents.ts ✅
• 04-live-swarm.ts ✅ (10-agent live swarm, gpt-5.2)
• 05-code-review-swarm.ts ✅ (5 reviewers + 5 fixers + merger)

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Full changelog

See CHANGELOG.md for complete history.

<hr /><em>This discussion was created from the release <a href='https://github.com/jovanSAPFIONEER/Network-AI/releases/tag/v3.5.0'>v3.5.0 — Pluggable Backend API (Phase 5 Part 2)</a>.</em>