feat(agent_panel): unified agent panel 2b — view shell (merged list + transcript + composer)

[BunsDev]

Description

What: Implements sub-phase 2b of the unified agent panel (plan in #206) — a new, feature-flagged app/src/agent_panel/AgentPanelView: a merged conversation list (CLI + Coven-daemon, each badged) + the shared agent_transcript transcript + a composer shell — reachable via cmd-shift-U / ctrl-shift-U. The two existing panels are left untouched.

Why: After 2a (#205) unified the conversation data model, this gives it a single surface. It's the view shell that 2c (composer routing + live daemon source) and 2d (default entry point + deprecation) build on.

How:

• New FeatureFlag::UnifiedAgentPanel + agent_panel::feature_flag::is_enabled.
• AgentPanelView (mirrors cli_chat::ChatPanelView: holds the singleton ChatModel + a SubmittableTextInput), with self-contained render helpers (view/{header,conversation_list,transcript,composer}.rs) that depend only on the cli_chat model layer + the shared agent_transcript renderer — never cli_chat::view (which 2d deletes). List rows carry a backend badge (CLI / Coven).
• migrate_stream_history_file (from 2a) is wired into ChatModel::new bootstrap, so migrated coven-code daemon conversations join the merged list.
• Workspace registration: panel field, flag-gated construction, right-dock render (360px), ToggleUnifiedAgentPanel action + handler, keybinding, and menu item.
• check_cli_chat_boundary extended to cover app/src/agent_panel.

Scope boundary (deferred): the composer is a shell — active for a live CLI conversation (submits via the existing WorkspaceAction::SubmitChatPrompt → terminal PTY), disabled placeholder otherwise. Per-backend routing + the live daemon send/stream + the daemon conversation source are 2c; deleting the old panels / making this the default is 2d.

Linked Issue

Implements the 2b plan (#206). Continues the reconciliation roadmap (design #204; 2a #205; Phase 1 #201).

Testing

• cargo nextest run -p warp-app --features cast-agent — new agent_panel tests (backend badge; AgentPanelView layout-safety via with_model + an unwired in-memory model) + a cli_chat bootstrap test (migrated daemon conversation surfaces in the model), plus the full pre-existing cli_chat/agent_transcript suites unchanged.
• cargo check -p warp-app --bin cast-codes --features gui,cast-agent links (full workspace/menu/keybinding wiring).
• cargo clippy -p warp-app --features cast-agent --all-targets -- -D warnings clean; cargo fmt -- --check clean.
• ./script/check_cli_chat_boundary (now covering agent_panel), ./script/check_ai_attribution, ./script/check_rebrand pass.

Agent Mode

• CastCodes Agent Mode — PR via CastCodes. Join OpenCoven on Discord for support.

[Copilot]

Pull request overview

Implements sub-phase 2b of the unified agent panel by adding a new feature-flagged AgentPanelView surface that combines a merged conversation list (CLI + migrated daemon conversations), the shared agent_transcript renderer, and a composer shell, with workspace wiring (action, keybinding, menu item) to toggle it.

Changes:

• Add FeatureFlag::UnifiedAgentPanel plus agent_panel::feature_flag::is_enabled() gating.
• Introduce app/src/agent_panel/AgentPanelView with split render helpers (header / list / transcript / composer) and basic layout-safety tests.
• Wire workspace registration (panel handle + toggle action + keybinding + menu item), and hook daemon stream-history migration into ChatModel::new bootstrap.

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
script/check_cli_chat_boundary	Extends fork-local boundary checks to include app/src/agent_panel.
crates/warp_features/src/lib.rs	Adds FeatureFlag::UnifiedAgentPanel.
app/src/lib.rs	Registers the new agent_panel module (non-wasm).
app/src/app_menus.rs	Adds menu item to toggle the unified agent panel when enabled.
app/src/util/bindings.rs	Adds CustomAction::ToggleUnifiedAgentPanel default keystroke mapping (cmd/ctrl-shift-U).
app/src/workspace/action.rs	Adds WorkspaceAction::ToggleUnifiedAgentPanel and marks it as non-blocking for restart flows.
app/src/workspace/mod.rs	Registers the editable binding/action for toggling the unified agent panel (flag-gated).
app/src/workspace/util.rs	Adds persisted workspace state bit is_agent_panel_open.
app/src/workspace/view.rs	Constructs/renders the unified agent panel in the right dock and handles the toggle action.
app/src/cli_chat/model.rs	Runs daemon stream-history.json migration at ChatModel bootstrap before loading history.
app/src/cli_chat/model_tests.rs	Adds test ensuring migrated daemon conversations surface on model bootstrap.
app/src/agent_panel/feature_flag.rs	Adds convenience accessor for UnifiedAgentPanel enablement.
app/src/agent_panel/mod.rs	Adds AgentPanelView (holds ChatModel + composer input) and panel layout composition.
app/src/agent_panel/strings.rs	Adds user-facing strings for the unified agent panel and backend badges.
app/src/agent_panel/view/mod.rs	Declares render helper modules for the unified agent panel.
app/src/agent_panel/view/header.rs	Implements header label + “New chat” button.
app/src/agent_panel/view/conversation_list.rs	Implements merged conversation list with backend badges and row click behavior.
app/src/agent_panel/view/transcript.rs	Renders transcript via agent_transcript, with empty-state + skipped-event hinting.
app/src/agent_panel/view/composer.rs	Implements composer shell (active only for live CLI binding in 2b).
app/src/agent_panel/view_tests.rs	Adds basic tests (badge mapping + layout non-panicking render).

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