feat: pivot to AI-native task management platform (#232)

Replace the agent framework codebase with a new monorepo structure
for an AI-native Linear-like product where agents are first-class citizens.

New architecture:
- server/ — Go backend (Chi + gorilla/websocket + sqlc)
  - API server with REST routes for issues, agents, inbox, workspaces
  - WebSocket hub for real-time updates
  - Local daemon entry point for agent runtime connection
  - PostgreSQL migration with 13 tables (issue, agent, inbox, etc.)
  - WebSocket protocol types for server<->daemon communication
- apps/web/ — Next.js 16 frontend
  - Dashboard layout with sidebar navigation
  - Route skeleton: inbox, issues, agents, board, settings
- packages/ui/ — Preserved shadcn/ui design system (26+ components)
- packages/types/ — Full API contract types (Issue, Agent, Workspace, Inbox, Events)
- packages/sdk/ — REST ApiClient + WebSocket WSClient
- packages/store/ — Zustand stores (issue, agent, inbox, auth)
- packages/hooks/ — React hooks (useIssues, useAgents, useInbox, useRealtime)
- packages/utils/ — Shared utilities

Removed: apps/cli, apps/desktop, apps/mobile, apps/gateway,
packages/core, skills/, and all agent-framework code.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

server/pkg/protocol/events.go

@@ -0,0 +1,25 @@
+package protocol
+
+// Event types for WebSocket communication between server, web clients, and daemon.
+const (
+	// Issue events
+	EventIssueCreated = "issue:created"
+	EventIssueUpdated = "issue:updated"
+	EventIssueDeleted = "issue:deleted"
+
+	// Agent events
+	EventAgentStatus = "agent:status"
+
+	// Task events (server <-> daemon)
+	EventTaskDispatch  = "task:dispatch"
+	EventTaskProgress  = "task:progress"
+	EventTaskCompleted = "task:completed"
+	EventTaskFailed    = "task:failed"
+
+	// Inbox events
+	EventInboxNew = "inbox:new"
+
+	// Daemon events
+	EventDaemonHeartbeat = "daemon:heartbeat"
+	EventDaemonRegister  = "daemon:register"
+)

server/pkg/protocol/messages.go

@@ -0,0 +1,63 @@
+package protocol
+
+import "encoding/json"
+
+// Message is the envelope for all WebSocket messages.
+type Message struct {
+	Type    string          `json:"type"`
+	Payload json.RawMessage `json:"payload"`
+}
+
+// TaskDispatchPayload is sent from server to daemon when a task is assigned.
+type TaskDispatchPayload struct {
+	TaskID             string   `json:"task_id"`
+	IssueID            string   `json:"issue_id"`
+	Title              string   `json:"title"`
+	Description        string   `json:"description"`
+	AcceptanceCriteria []string `json:"acceptance_criteria"`
+	ContextRefs        []string `json:"context_refs"`
+	Repository         *RepoRef `json:"repository,omitempty"`
+}
+
+// RepoRef points to a code repository.
+type RepoRef struct {
+	URL    string `json:"url"`
+	Branch string `json:"branch,omitempty"`
+	Path   string `json:"path,omitempty"`
+}
+
+// TaskProgressPayload is sent from daemon to server during task execution.
+type TaskProgressPayload struct {
+	TaskID  string `json:"task_id"`
+	Summary string `json:"summary"`
+	Step    int    `json:"step,omitempty"`
+	Total   int    `json:"total,omitempty"`
+}
+
+// TaskCompletedPayload is sent from daemon to server when a task finishes.
+type TaskCompletedPayload struct {
+	TaskID string `json:"task_id"`
+	PRURL  string `json:"pr_url,omitempty"`
+	Output string `json:"output,omitempty"`
+}
+
+// DaemonRegisterPayload is sent from daemon to server on connection.
+type DaemonRegisterPayload struct {
+	DaemonID string        `json:"daemon_id"`
+	AgentID  string        `json:"agent_id"`
+	Runtimes []RuntimeInfo `json:"runtimes"`
+}
+
+// RuntimeInfo describes an available agent runtime on the daemon's machine.
+type RuntimeInfo struct {
+	Type    string `json:"type"`
+	Version string `json:"version"`
+	Status  string `json:"status"`
+}
+
+// HeartbeatPayload is sent periodically from daemon to server.
+type HeartbeatPayload struct {
+	DaemonID     string `json:"daemon_id"`
+	AgentID      string `json:"agent_id"`
+	CurrentTasks int    `json:"current_tasks"`
+}