MCP: add bizMonitor server, align ops/topology tools, harden CLI exec

- New packages/netx-bizmonitor-mcp: 8 read-only cutover/biz-state tools
  mirroring the netxops bizMonitor group.
- Align netx-mcp (15) and netx-topology-mcp (16) with backend HTTP
  contracts; surface partial batch failures as tool errors.
- CLI hard gate: single-line show/display only; exec job IDs, path
  containment, owner and ne:exec checks.
- Cisco IOSv collection: stable prompt/echo handling over CR.
- Remove legacy netx_api/mcp and mcp_server.py; add mcp.all.json;
  sync skills and docs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/fixtures/zte_vpnv6/show-bgp-vpnv6-neighbor-router-out-vrf

@@ -0,0 +1,11 @@
+MDN-BCP-CN1-ZM8SP#show bgp vpnv6 unicast vrf vpn.giims neighbor out 2407::45:0:0:5:1 | one-line                                                                              
+09:51:15 Indonesia Sat Sep 19 2026
+Routes Sent To This Neighbor:
+Origin codes: i - IGP, e - EGP, ? - incomplete
+Total number of routes: 1
+Network            Next Hop        From            Metric LocPrf Path
+
+2407::45:0:0:5:0/127
+                   2407::45:0:0:5:0
+                                                                 4761 ?
+MDN-BCP-CN1-ZM8SP#