Epic: Permission Persistence and MCP Transport Parity

[bug-ops]

Summary

Permission decisions are in-memory only (lost on restart). MCP bridge only supports stdio servers, skipping HTTP/SSE.

Critical Path

[Epics 1+2 complete] ──→ [6.1 Permission persistence]  ─┐ (parallel)
                     ──→ [6.2 HTTP MCP passthrough]     ─┘

• Depends on: Epics 1+2 (Epic: Wire AcpContext into Agent Loop #777, Epic: Session Lifecycle Management #778)
• Parallel with: Epics 3-5, Epic 8
• 6.1 and 6.2 are independent

Acceptance Criteria

• AllowAlways/RejectAlways decisions persisted to TOML file
• Decisions loaded on session start
• McpServer::Http bridged to zeph-mcp HTTP transport