docs(subagents): add comprehensive documentation

Package README (372 lines):
- Overview of Central Nervous System architecture
- Core components with usage examples
- Message protocol specification
- Agent interface and custom agent guide
- Testing instructions and coverage stats (90%+)
- Design principles (physiology-inspired)
- Future roadmap (logger extraction to @lytics/croak)
- Development workflow and contributing guidelines

Coordinator README (588 lines):
- Detailed architecture breakdown
- SubagentCoordinator complete API documentation
- ContextManager state management guide
- TaskQueue priority scheduling and concurrency
- Full integration example showing all components
- Error handling patterns and best practices
- Performance considerations and tuning
- Future enhancements roadmap

Documentation Features:
- Real-world usage examples
- Code snippets for all components
- Clear API documentation
- Integration patterns
- Performance tips
- Troubleshooting guides

Makes the coordinator system immediately usable by:
- New developers
- External integrations
- Future agent implementations

Ticket: #7

Author: prosdev

packages/subagents/README.md

@@ -0,0 +1,371 @@
+# @lytics/dev-agent-subagents
+
+**The Central Nervous System** for dev-agent's multi-agent coordination.
+
+## Overview
+
+The subagents package provides a robust, production-ready coordinator system for managing specialized AI agents. Inspired by human physiology, each component mirrors a part of the nervous system:
+
+- **🧠 Coordinator** - The brain, orchestrating all agents
+- **🔬 Context Manager** - The hippocampus, managing shared memory
+- **⚡ Task Queue** - The motor cortex, controlling execution
+- **📊 Logger** - Observability system (future: `@lytics/croak`)
+
+## Architecture
+
+```
+packages/subagents/
+├── coordinator/           # Central Nervous System
+│   ├── coordinator.ts    # Main orchestrator
+│   ├── context-manager.ts # Shared state & repository access
+│   └── task-queue.ts     # Task execution & concurrency
+│
+├── logger/               # Structured logging (extractable)
+│   └── index.ts         
+│
+├── planner/              # Planning agent (stub)
+├── explorer/             # Code exploration agent (stub)
+├── pr/                   # GitHub PR agent (stub)
+│
+└── types.ts              # Shared interfaces
+```
+
+### Self-Contained Design
+
+Each folder is designed to be:
+- **Tree-shakable** - Import only what you need
+- **Extractable** - Easy to pull out into separate packages
+- **Independent** - Minimal cross-dependencies
+- **Testable** - Comprehensive test coverage (90%+)
+
+## Core Components
+
+### SubagentCoordinator
+
+The main orchestrator that manages agent lifecycle, message passing, and task execution.
+
+```typescript
+import { SubagentCoordinator, PlannerAgent } from '@lytics/dev-agent-subagents';
+
+// Initialize coordinator
+const coordinator = new SubagentCoordinator();
+await coordinator.initialize({
+  repositoryPath: '/path/to/repo',
+  vectorStorePath: '/path/to/vectors',
+  maxConcurrentTasks: 5,
+});
+
+// Register agents
+coordinator.registerAgent(new PlannerAgent());
+
+// Send messages
+const response = await coordinator.sendMessage({
+  id: 'msg-1',
+  type: 'request',
+  sender: 'user',
+  recipient: 'planner',
+  payload: { action: 'create-plan', goal: 'Implement authentication' },
+  timestamp: Date.now(),
+});
+
+// Get stats
+const stats = coordinator.getStats();
+console.log(`Active agents: ${stats.agentsRegistered}`);
+```
+
+### ContextManager
+
+Manages shared state, repository access, and message history.
+
+```typescript
+import { ContextManagerImpl } from '@lytics/dev-agent-subagents';
+
+const context = new ContextManagerImpl({ maxHistorySize: 1000 });
+
+// Store shared state
+context.set('currentPhase', 'planning');
+const phase = context.get('currentPhase');
+
+// Message history
+context.addToHistory(message);
+const recent = context.getHistory(10); // Last 10 messages
+
+// Repository access
+context.setIndexer(repositoryIndexer);
+const indexer = context.getIndexer();
+```
+
+### TaskQueue
+
+Priority-based task queue with concurrency control and retry logic.
+
+```typescript
+import { TaskQueue, CoordinatorLogger } from '@lytics/dev-agent-subagents';
+
+const logger = new CoordinatorLogger('my-app', 'info');
+const queue = new TaskQueue(3, logger); // max 3 concurrent
+
+// Enqueue tasks
+queue.enqueue({
+  id: 'task-1',
+  type: 'analyze-code',
+  agentName: 'explorer',
+  payload: { file: 'src/index.ts' },
+  priority: 8, // 0-10, higher = more priority
+  status: 'pending',
+  createdAt: Date.now(),
+  retries: 0,
+  maxRetries: 3,
+});
+
+// Execute tasks
+const next = queue.getNext(); // Highest priority pending task
+if (next && queue.canRunMore()) {
+  queue.markRunning(next.id);
+  // ... execute task ...
+  queue.markCompleted(next.id, result);
+}
+
+// Retry failed tasks
+if (queue.shouldRetry('task-1')) {
+  queue.retry('task-1');
+}
+
+// Stats
+const stats = queue.getStats();
+console.log(`Pending: ${stats.pending}, Running: ${stats.running}`);
+```
+
+### Logger
+
+Structured logging with context and log levels (future: `@lytics/croak`).
+
+```typescript
+import { CoordinatorLogger } from '@lytics/dev-agent-subagents';
+
+const logger = new CoordinatorLogger('my-service', 'info');
+
+logger.info('Service started', { port: 3000 });
+logger.warn('High memory usage', { usage: '85%' });
+logger.error('Connection failed', error, { retries: 3 });
+
+// Child loggers
+const childLogger = logger.child('database');
+childLogger.debug('Query executed', { duration: '45ms' });
+```
+
+## Message Protocol
+
+All agent communication uses standardized messages:
+
+```typescript
+interface Message {
+  id: string;              // Unique message ID
+  type: 'request' | 'response' | 'event' | 'error';
+  sender: string;          // Agent name or 'user'
+  recipient: string;       // Target agent name
+  payload: Record<string, unknown>;
+  timestamp: number;
+  correlationId?: string;  // Link responses to requests
+  priority?: number;       // 0-10, for task scheduling
+  timeout?: number;        // ms, for requests
+  error?: {
+    message: string;
+    stack?: string;
+    code?: string;
+  };
+}
+```
+
+## Agent Interface
+
+All agents implement the `Agent` interface:
+
+```typescript
+interface Agent {
+  name: string;
+  capabilities: string[];
+  
+  initialize(context: AgentContext): Promise<void>;
+  handleMessage(message: Message): Promise<Message | null>;
+  healthCheck(): Promise<boolean>;
+  shutdown(): Promise<void>;
+}
+```
+
+### Creating a Custom Agent
+
+```typescript
+import type { Agent, AgentContext, Message } from '@lytics/dev-agent-subagents';
+
+class MyCustomAgent implements Agent {
+  name = 'my-agent';
+  capabilities = ['analyze', 'summarize'];
+  private context?: AgentContext;
+
+  async initialize(context: AgentContext): Promise<void> {
+    this.context = context;
+    this.name = context.agentName;
+    context.logger.info('Agent initialized');
+  }
+
+  async handleMessage(message: Message): Promise<Message | null> {
+    if (!this.context) {
+      throw new Error('Agent not initialized');
+    }
+
+    // Use repository indexer
+    const results = await this.context.indexer.search(
+      message.payload.query as string,
+      { limit: 5 }
+    );
+
+    // Return response
+    return {
+      id: `${message.id}-response`,
+      type: 'response',
+      sender: this.name,
+      recipient: message.sender,
+      correlationId: message.id,
+      payload: { results },
+      timestamp: Date.now(),
+    };
+  }
+
+  async healthCheck(): Promise<boolean> {
+    return !!this.context;
+  }
+
+  async shutdown(): Promise<void> {
+    this.context?.logger.info('Agent shutting down');
+    this.context = undefined;
+  }
+}
+```
+
+## Current Agents
+
+### Planner (Stub)
+- **Status**: Basic stub implementation
+- **Capabilities**: `['plan', 'break-down-tasks']`
+- **Future**: Convert GitHub issues to actionable tasks
+
+### Explorer (Stub)
+- **Status**: Basic stub implementation
+- **Capabilities**: `['explore', 'analyze-patterns', 'find-similar']`
+- **Future**: Semantic code exploration and pattern detection
+
+### PR Agent (Stub)
+- **Status**: Basic stub implementation
+- **Capabilities**: `['create-pr', 'update-pr', 'manage-issues', 'comment']`
+- **Future**: GitHub integration for PRs and issues
+
+## Testing
+
+Comprehensive test suite with 90%+ coverage:
+
+```bash
+# Run all subagents tests
+pnpm test packages/subagents
+
+# Watch mode
+cd packages/subagents && pnpm test:watch
+
+# Coverage report
+pnpm vitest run packages/subagents --coverage
+```
+
+**Test Coverage:**
+- Context Manager: 100% statements, 100% branches
+- Task Queue: 97% statements, 89% branches
+- Logger: 89% statements, 93% branches
+
+## Development
+
+```bash
+# Install dependencies
+pnpm install
+
+# Build
+pnpm -F "@lytics/dev-agent-subagents" build
+
+# Watch mode
+pnpm -F "@lytics/dev-agent-subagents" dev
+
+# Lint
+pnpm -F "@lytics/dev-agent-subagents" lint
+
+# Type check
+pnpm -F "@lytics/dev-agent-subagents" typecheck
+```
+
+## Design Principles
+
+### 1. Central Nervous System Metaphor
+Every component is named and designed around human physiology:
+- **Coordinator** = Brain
+- **Context Manager** = Hippocampus (memory)
+- **Task Queue** = Motor Cortex (action)
+- **Agents** = Specialized neural regions
+
+### 2. Message-Driven Architecture
+All communication happens through standardized messages, enabling:
+- Async agent execution
+- Message correlation and tracking
+- Priority-based scheduling
+- Timeout handling
+
+### 3. Shared Context
+Agents access shared resources through `AgentContext`:
+- Repository indexer (semantic search)
+- GitHub API (future)
+- Shared state
+- Message history
+- Structured logger
+
+### 4. Graceful Degradation
+System remains operational even if:
+- Individual agents fail
+- Tasks timeout
+- Resources are unavailable
+
+## Future Plans
+
+### Logger Extraction (`@lytics/croak`)
+The logger is designed to be extracted into a standalone package for use across Lytics projects:
+
+```typescript
+// Future: @lytics/croak
+import { Croak } from '@lytics/croak';
+
+const logger = new Croak('my-service', {
+  level: 'info',
+  outputs: ['console', 'file'],
+  format: 'json',
+});
+```
+
+### Agent Implementations
+1. **Planner**: GitHub issue → task breakdown
+2. **Explorer**: Semantic code exploration
+3. **PR Agent**: Automated PR creation and management
+
+### Coordinator Enhancements
+- Agent discovery and registration
+- Health monitoring and auto-restart
+- Metrics and observability
+- Persistent task queue
+
+## Contributing
+
+This is an internal Lytics project, but designed with open-source best practices:
+
+1. **TypeScript strict mode** - Type safety first
+2. **Comprehensive tests** - 90%+ coverage target
+3. **Clear documentation** - READMEs and inline docs
+4. **Self-contained modules** - Easy to extract/refactor
+
+## License
+
+MIT © Lytics, Inc.
+