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/test_zte_extended_parsers.py

@@ -270,7 +270,7 @@ class ZteExtendedParserTests(unittest.TestCase):
         self.assertTrue(all(r["afi"] == "ipv4" for r in vrf), "vrf-scoped vpnv4 → ipv4")
 
         # Real wrapped vpnv6 summary + IPv6 neighbor in/out routes
-        sample_dir = Path(__file__).resolve().parents[2] / "test" / "show-zte"
+        sample_dir = Path(__file__).resolve().parent / "fixtures" / "zte_vpnv6"
         v6_sum = (sample_dir / "show-bgp-vpnv6").read_text(encoding="utf-8", errors="replace")
         v6_real = normalize_bgp_peer(
             raw_text=v6_sum, command="show bgp vpnv6 unicast summary | one-line"