docs: record Telegram AI chat validation

Merge pull request #57: add conversational Telegram AI chat

docs/agent-handoff.md

@@ -1,6 +1,6 @@
 # Agent Handoff
 
-Last updated: 2026-07-04
+Last updated: 2026-07-05
 
 ## Latest Completed Work
 
@@ -17,6 +17,11 @@ Last updated: 2026-07-04
 - Live Dockge verification on 2026-07-04 used `LLM_TIMEOUT_MS=300000` and `LLM_MAX_TOKENS=4096` with the `heim-llm` LiteLLM alias. The completed sweep produced six parsed ideas, reported `ideasSource=llm`, persisted memory, and had no `lastSweepError`.
 - Production implementation commit: `14d9276c30e06cafcaee8177ba7377fdf5f26277`.
 - Issues #47, #51, and #53 are complete. Issue #21 tracks the failing security scan and #45 tracks the dependency workflow.
+- PR #57 / issue #56 added conversational Telegram AI chat for normal text plus `/ask` and `/reset`, bounded in-memory history, current intelligence grounding, typing activity, strict chat allowlisting, and plain-text replies.
+- Private Telegram chat messages are excluded from OSINT ingestion, and polling is serialized while a model response is running.
+- Gitea Actions runs 263-267 passed for the feature and production merge.
+- Live Dockge verification on 2026-07-05 reported `telegramAiChat.enabled=true`. A real `heim-llm` question using current dashboard context completed in 34 seconds and the answer was delivered successfully through the configured Telegram bot.
+- Current Telegram-chat implementation commit: `c86407d4f8bfb8a445bb7f4685ff545b479244a1`.
 
 ## Repository State