Feat/add pending background processes

[shehab299]

No description provided.

[Copilot]

Pull request overview

Adds visibility into pending/running background tasks during quit, and plumbs a shared TaskManagerHandle so the TUI can query task status directly (instead of being blind to subagent/background activity).

Changes:

• Thread a shared TaskManagerHandle from CLI interactive mode → MCP server + TUI, and allow MCP server to accept an externally-created handle.
• On first Ctrl+C in the TUI, asynchronously query tasks and update the “press Ctrl+C again” hint with the number of running/pending/paused background tasks.
• Extend TUI event types/handlers to carry and store the background-task count.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tui/src/services/hint_helper.rs	Renders a quit hint that includes background task count when available.
tui/src/services/handlers/mod.rs	Handles the new input event to update running_background_tasks; updates test state builder.
tui/src/services/handlers/misc.rs	On first Ctrl+C, spawns an async query to count active background tasks and sends an event back to the UI loop.
tui/src/event_loop.rs	Extends run_tui signature to accept a shared TaskManagerHandle and stores it in AppState.
tui/src/app/events.rs	Adds RunningBackgroundTasksCount input event and marks it as a backend/non-interceptable event.
tui/src/app.rs	Adds task_manager_handle and running_background_tasks to AppState and AppStateOptions.
libs/mcp/server/src/lib.rs	Adds optional task_manager_handle to server config; uses provided handle or creates its own TaskManager.
cli/src/commands/mcp/server.rs	Populates new MCP server config field with None for standalone server.
cli/src/commands/autopilot/mod.rs	Uses struct update syntax to pick up new McpInitConfig fields.
cli/src/commands/agent/run/mode_interactive.rs	Creates and runs a shared TaskManager; passes handle to both TUI and MCP server init.
cli/src/commands/agent/run/mode_async.rs	Uses struct update syntax to pick up new McpInitConfig fields.
cli/src/commands/agent/run/mcp_init.rs	Adds task_manager_handle to init config and forwards it into MCPServerConfig.

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