feat(mcp): MCP server for AI agents, agent scopes on API keys, switches in settings

MindSift now speaks MCP (Streamable HTTP, stateless JSON-RPC) at POST /api/v1/mcp so
Claude Code, Codex, Claude Desktop, Cursor and custom agents can read, create and
complete tasks and keep shared lists. API keys get the scopes tasks:read/write and
lists:read/write; tools/list only shows what the key may call and every tool checks
its scope. Task and list write paths are shared helpers (updateTask, createTask,
addListItem, setListItemDone) used by REST and MCP alike.

Settings: scope selection and the SectionPicker (import, restore) use ToggleSwitch
rows instead of checkbox-like buttons; new MCP section with connection snippets for
Claude Code, Codex and JSON configs. Docs, README, help and changelog updated; v0.28.0.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/storage/apikeys.go

@@ -10,13 +10,23 @@ import (
 
 // --- API KEYS & WEBHOOKS ---
 
-// Scopes of an API key: what it may deliver. A key never reads data.
+// Scopes of an API key. The webhook scopes deliver data (inbox, /webhooks/ingest); the agent scopes
+// let AI agents read and change tasks and lists over the MCP endpoint. Notes are never reachable with
+// a key.
 const (
 	ScopeTriage = "webhook:triage" // thoughts into the inbox
 	ScopeTask   = "webhook:task"   // tasks directly
 	ScopeList   = "webhook:list"   // items into lists
+
+	ScopeTasksRead  = "tasks:read"  // MCP: task lists and tasks
+	ScopeTasksWrite = "tasks:write" // MCP: create, change and complete tasks
+	ScopeListsRead  = "lists:read"  // MCP: lists and their items
+	ScopeListsWrite = "lists:write" // MCP: add, change and check off items
 )
 
+// AllScopes in display order.
+var AllScopes = []string{ScopeTriage, ScopeTask, ScopeList, ScopeTasksRead, ScopeTasksWrite, ScopeListsRead, ScopeListsWrite}
+
 // NormalizeScopes keeps the known scopes in a fixed order; none at all means triage only.
 func NormalizeScopes(scopes []string) []string {
 	want := map[string]bool{}
@@ -24,7 +34,7 @@ func NormalizeScopes(scopes []string) []string {
 		want[strings.ToLower(strings.TrimSpace(sc))] = true
 	}
 	out := []string{}
-	for _, sc := range []string{ScopeTriage, ScopeTask, ScopeList} {
+	for _, sc := range AllScopes {
 		if want[sc] {
 			out = append(out, sc)
 		}