fix(retained): preserve Claude session after interrupted turns

[dviejokfs]

Root cause

The retained runtime only stored the provider session ID from a successful TurnResult. Claude announces the session earlier through SessionStarted; when a running turn is interrupted, its completion is Cancelled, so the runtime discarded the announced ID. The next follow-up started a new Claude session without history.

Fix

Capture the latest session announced during each invocation and retain it after success, failure, or cancellation. Prefer the completed turn's session ID when one exists.

Evidence

The new interrupted_turn_keeps_the_session_the_provider_already_started regression test failed before the fix with [None, None] and passes with the follow-up receiving session-interrupted. cargo fmt --check, cargo test --all-features, and clippy with warnings denied passed locally.

Fleet integration will pin the corresponding commit on feat/provider-process-retention once this review is clear.

[dviejokfs]

@greptileai Please review this SDK session-retention fix.

[dviejokfs]

@greptile-apps

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge.

Summary

The retained runtime now remembers a session announced during an invocation and reuses it after interruption or failure, preferring a completed turn’s session ID when available. A regression test verifies that a follow-up after interruption receives the announced ID.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Provider emits SessionStarted] --> B[Invocation caches session ID]
  B --> C{Turn completes}
  C -->|Result has session ID| D[Retain result ID]
  C -->|No result session ID| E[Retain announced ID]
  D --> F[Next turn resumes session]
  E --> F

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