v2.7.2a1

Pre-release for live testing (agno 2.7.2a1 + agnoctl 0.1.2a1, lockstep).

• AgentOS(mcp_server=...) replaces enable_mcp_server + mcp_config (deprecated aliases kept, wire format unchanged)
• OAuth on the AgentOS MCP endpoint: AgentOSBuiltinAuth (built-in AS, BaseDb-backed store) + BYO fastmcp AuthProvider (AuthKit), PAT/JWT coexistence via MultiAuth, trust-marker scrubbing for external IdPs
• agno connect round 2: multi-target discovery/select, disconnect (URL-guarded removal), identity-named entries, restart hints, OAuth-first registration when /mcp is OAuth-protected