hermes - 💡(How to fix) Fix Roadmap: make gateway platforms first-class clients

Summary

Treat gateway platforms as first-class clients by normalizing command behavior, attachment handling, diagnostics, and replay testing across adapters.

Proposed scope

• Define a unified gateway command contract across Slack, Telegram, Discord, Matrix, and other adapters.
• Maintain a per-platform capability matrix.
• Add diagnostics for message threading, session mapping, and delivery failures.
• Normalize attachments, files, and media into a common event model.
• Add replay tests based on saved platform event fixtures.
• Provide an admin/dashboard view for connected platforms and recent failures.

Acceptance criteria

• Gateway behavior is easier to reason about across platforms.
• Adapter regressions can be tested with fixtures.
• Operators can diagnose platform/session issues without digging through raw logs first.