Parent and architecture

• Implementation epic: #6
• Architecture: #1
• Depends on: frontend-neutral ingestion #22, Telegram control plane #8

Outcome

Adapt Telegram transport identity, update deduplication, commands and attachments to the frontend-neutral canonical user-event ingestion contract after the core event spine is complete.

Estimate

• 3 SP / 2 engineering days
• Risk: medium

Scope

• Map Telegram user/chat/topic identities to canonical external identities and frontend bindings.
• Initialize the first authorized DM binding through the enrollment/membership policy; never derive tenant authority from a chat or user ID.
• Translate a normal Telegram update into the generic append-user-event/run request from #22.
• Translate /new into canonical session creation plus atomic binding switch.
• Preserve Telegram update/message deduplication and transport metadata without using them as canonical session IDs.
• Store Telegram files through canonical tenant/session/event attachment manifests.
• Preserve DM-only and unsupported-update behavior.
• Replace remaining Telegram context-epoch command/help semantics.
• Update public Telegram adapter documentation and tests.

Verification

• Duplicate Telegram updates create one canonical user event, run, attempt and dispatch.
• Two /new commands create distinct sessions and retain prior history.
• Two Telegram tenants cannot cross-bind or access another tenant's sessions/files.
• Stale concurrent binding switches fail safely.
• Transport failures do not leave a partial canonical event/run.

Acceptance criteria

• Telegram is an adapter over the same ingestion contract used by the WebUI and synthetic frontend.
• No Telegram ingress path creates or advances context_epoch.
• Telegram remains authoritative only for Telegram transport facts.
• This issue can be scheduled after the canonical core and WebUI auth slices.

Non-goals

• Canonical event persistence implementation.
• Assistant/tool finalization.
• External cloud reachability edge #17.
• Telegram result projection.