[trissim]

Clicking a conversation details title read a fresh global registry snapshot to resolve the name of the peer already shown by the row. If that incarnation had just disappeared, the second lookup raised KeyError.

The title handler now opens target=self.label (src/toad/widgets/session_details.py:175). label already reads self.row.name at :167. The global references read is deleted.

Keep peer and its constructor parameter: ChannelActivity.rows keys retained widgets by row.peer at src/toad/widgets/channel_activity.py:36, and changed_keys reads row.peer at :74. Both constructor sites remain valid: src/toad/conversation_kind.py:290 and src/toad/widgets/channel_activity.py:61. A grep across src and tests finds those two calls and the declaration.

Evidence only, no navigation edits: ThreadNavigator.open reads comms.registry.snapshot().require(target) at src/toad/thread_navigation.py:68-71. RegistryNames.require canonicalizes the name, indexes threads, and converts the missing key into UnregisteredThreadError("Thread {canonical!r} is not registered.") at agent-comms src/agent_comms/registry_provenance.py:155-160. The preparation worker returns task.result() at toad src/toad/work_preparation.py:293, so it propagates the exception. open's only catch is the earlier source-origin RelationViolationError at thread_navigation.py:56-59; the missing-name lookup is outside it and escapes to the caller. No catch added.

Validation at 921b1ce: the changed file parses; git diff --check is clean; pushed head equals ls-remote. No tests run. SessionNavigation and WorkspaceSessions are untouched.

Assumed: ChannelActivity still needs peer as its stable row key; missing-name navigation behavior is intentionally unchanged pending the next order.

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