Agent view, goal completion, and governance hardening

What this changes for operators

• claude agents is the new canonical surface for multi-session supervision; operators running parallel Claude Code sessions should evaluate it now as their primary management interface.
• /goal changes how long-running autonomous work is structured; operators should test goal-based termination against their most common multi-turn workflows.
• continueOnBlock enables advisory governance hooks; existing PostToolUse blocks should be redesigned to pass rejection reasons so Claude can adapt rather than just stop.
• x-claude-code-agent-id / x-claude-code-parent-agent-id headers and OTel span attributes enable call-tree attribution; logging pipelines receiving Anthropic API calls should start capturing these to distinguish parent sessions from subagents.
• API key auth now disables Remote Control, /schedule, and claude.ai MCP connectors; operators using API key should audit reliance on these surfaces before upgrading.