Introduce a command to steer agent mid-reasoning

### Describe the feature or problem you'd like to solve

Introduce a command (e.g., /run-now or !execute) that forces the agent to immediately attempt execution of a reasoning/action step instead of placing it in the queue.

### Proposed solution

**Problem Statement**
In the current workflow, agent actions (such as reasoning steps, code edits, or shell commands) are queued and executed sequentially. While this ensures consistency and traceability, it introduces friction in scenarios where:

The next step is trivial and does not depend on queued items
The user wants to override the execution order
The queue contains low-priority or long-running tasks that block progress
Iterative debugging requires fast feedback loops

**From the screenshot below:**

The step “but make sure nothing is duplicated” remains [pending]
It is delayed behind other operations (e.g., rebase, state checks)
There is no way to prioritize or force execution

**Proposed Solution**
Add a command that allows users to bypass the queue and trigger immediate execution of a step.
Example commands

/run-now
/execute-immediately
ctrl+enter (alternate keybinding option)

### Example prompts or workflows

_No response_

### Additional context

_No response_

Start by tracing the existing command-handling entry point and the action queue described in the issue, including how reasoning steps, edits, and shell commands are dispatched. Determine how an explicit command or keybinding could request immediate execution, and consider the queue-ordering and consistency implications. Done means a user can trigger a step immediately while existing queued work remains understandable and traceable.

Scritto dal modello di indicizzazione a partire dal testo della issue.