feat: Telegram adapter

[chaodu-agent]

Feature Request

Add a Telegram adapter to OpenAB, enabling bot deployment on Telegram alongside the existing Discord and Slack adapters.

Desired Capabilities

• Implement ChatAdapter trait for Telegram (consistent with Discord/Slack architecture)
• Forum topic threading (one topic per conversation)
• Personal vs Team chat modes
• Streaming replies via message editing

Nice-to-Have (separate PRs)

These ideas came from PR #86 and are worth preserving as independent features:

• Memory compaction on eviction — summarize session before eviction, inject summary on resume
• Crash recovery context — store recent messages as fallback when agent crashes before compaction

Requirements Before Implementation

1. Community interest: this issue needs 30+ 👍 upvotes before we commit to implementation
2. Community owner: we need a volunteer to lead the PR and shepherd it through review
3. Architecture alignment: must implement ChatAdapter trait (see src/adapter.rs) — no standalone adapter that bypasses the shared routing/streaming infrastructure
4. Scope: Telegram adapter only — memory compaction and crash recovery should be separate PRs

Prior Art

• PR feat: Telegram adapter — session lifecycle, memory compaction & crash recovery #86 by @henrieopenclaw attempted this but predated the ChatAdapter refactor and is no longer compatible with current main
• OpenClaw supports Telegram via forum topics with thread bindings

How to Vote

👍 this issue if you want Telegram support. Once we hit 30 upvotes and have a community owner, we will greenlight implementation.

Discussion

Discord: https://discord.com/channels/1488041051187974246/1495752290454208513

Please discuss requirements, design ideas, and volunteer to lead in the Discord thread above.

[github-actions]

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