fix: return complete enhanced gateway capabilities

[Interstellar-code]

Summary

• include the newer enhanced capability fields in getEnhancedCapabilities()
• keep the exported capability snapshot aligned with the runtime probe state
• avoid UI/probe desync around gateway feature availability

Root cause

The runtime probe tracks newer enhanced capabilities such as conductor and kanban, but getEnhancedCapabilities() was still returning the older subset. That made the exported capability object incomplete and could desynchronize downstream UI logic from the actual probed backend state. In issue #275, that mismatch lined up with the remaining false-positive behavior after the earlier reconnect/probe fixes.

Validation

• verified the diff is isolated to src/server/gateway-capabilities.ts
• confirmed the missing fields are part of EnhancedCapabilities and runtime capabilities state
• no unrelated file changes included

Closes #275.