D-11: Lifecycle integration — TerminalSession ownership for Dialogue

[kirich1409]

Description

Integrate the ClaudeCodeJSONLSession adapter's lifecycle with the underlying TerminalSession — ensure the PTY / gRPC session is owned, started, reconnected, and terminated as a pair with the Dialogue session.

Spec: Epic #250 §4.3 (data flow).

Scope

Ownership model

ClaudeCodeJSONLSession owns a TerminalSession instance. Ownership implications:

• Creating a Dialogue session creates the underlying TerminalSession; terminating Dialogue terminates the terminal.
• TerminalFeature (the existing reducer) is not used for Dialogue sessions — the Dialogue session goes directly through TerminalEngine.makeSession(configuration:) → no reducer indirection.
• For .agentDialogue surface, the TerminalSession is registered into sharedTerminalRegistry with a distinct tag so UI can differentiate (useful for Stream Inspector).

Reconnect semantics (remote sessions)

• When RemoteTerminalSession.connectionState emits .reconnected, the VT-snapshot replay happens as usual. ClaudeCodeJSONLSession observes rawStdout — replay bytes flow in naturally and parser dedupes by session_id + event.index + uuid.
• If reconnect is impossible (runner drop, auth rotation) → status .error(ReconnectFailed) + UI shows retry banner.

Subagent nesting

• parent_tool_use_id ≠ null events — parser tags them, reducer routes them to the parent ToolCall.subagentTranscript sub-state (forward decision — nested reducer state inside ToolCall).
• Lifecycle of subagent is tied to parent tool call — subagent can't outlive parent.

Acceptance Criteria

• ClaudeCodeJSONLSession.start() spawns terminal process + starts parser consumption in one atomic step.
• .terminate() cleanly closes terminal, cancels consumer tasks, finishes transcript stream.
• Process exit mid-turn triggers parser close() + emits .error(UnexpectedExit) to transcript before finishing the stream.
• Remote reconnect: integration test with mocked gRPC drop → session re-attaches → parser dedupes replayed events → transcript state unchanged.
• Subagent parent_tool_use_id routing — unit test verifies nested events land in the correct ToolCall subagent sub-state.
• No leaked tasks or continuations after terminate() (verified by memory / task-counter tests).
• sharedTerminalRegistry contains the underlying session during its lifetime, removed on terminate.

Relationships

• Parent issue: EPIC: Dialogue — structured chat UI for agent sessions #250
• Blocked by: #D-9, #D-10
• Blocks: #D-18, #D-25 (Open as X cross-surface)