feat(session): continue from safe assistant and tool boundaries - #116
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The unchanged upstream termination test sends SIGTERM to the shared test runner. Parallel connected authentication also subscribes through Stop and can therefore return Completed(None) instead of the shell exit status. Both tests are identical on main da42ba4, M2 78fe3e2, and the M3 restack. Reproduce with the exact auth/signal pair: 20/20 failures before isolation, while each test alone and auth plus agent-exit pass 20/20. Re-execute only the signal sender in an exact-test child process, preserving real OS signal coverage without serializing authentication or changing production behavior. All pairs pass 20/20 afterward; bypassing isolation in the same binary reproduces 5/5 failures and restoring it passes 5/5. Validation: three default-parallel TUI runs (375 tests each), full locked tests, fmt, and strict locked all-target/all-feature Clippy pass. This narrow upstream test-isolation fix stays on M3 so reviewed parent refs remain unchanged.
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Summary
Extend
/branchto continue after committed assistant messages and tool-result boundaries, in addition to editing earlier user prompts. Assistant and tool checkpoints retain the selected item and open an empty draft for the next user message.Motivation
Builds on #115 toward message-level transcript navigation without discarding alternate futures.
Impact
Only a result that closes its complete tool-call batch is eligible; partial batches, orphan or duplicate results, and invalid ordering are rejected. Before-user checkout and its original-prompt prefill remain unchanged.
Technical details
Exact continuation prefixes
An ordered validator checks call/result structure without repairing, reordering, or borrowing later context. The existing historical address, provisional checkout, durable completion, and retry pipeline is reused without changing persistent lineage metadata.
Role-aware selection
The chooser labels User, Assistant, and Tool checkpoints and supports role filters. Roles are additive on the private response shape, with missing legacy values interpreted as User; preview text remains separate from the editable draft.