docs(notes): research — list conversations filtered by worktree/workspace

Investigation of whether the backend supports listing open conversations
filtered by a specific worktree/workspace.

Findings:
- 'worktree' is not a Dispatch domain concept; canonical term is 'workspace'
  (logical grouping) vs 'working directory' (cwd, filesystem path).
- GET /conversations already supports composable ?workspaceId=, ?status=, ?q=
  filters. 'Open conversations in workspace X' = ?workspaceId=X&status=active,idle.
- Every conversation carries a workspaceId (default 'default'); ConversationMeta
  is in @dispatch/wire; filter lives in conversation-store listConversations.
- A literal directory (git worktree) filter (?cwd=) is NOT supported; §3b
  documents the small additive change needed across wire/store/transport-http.
- Test coverage verified: store-workspace.test.ts:369, store.test.ts:1463,
  app.test.ts:3696.

Research notes only — no code/contract changes.

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