Changing workdir doesn't emit event anymore

### Describe the bug

When changing the workdir using the `/cwd new-path` it doesn't record the information in the `events.jsonl` being impossible to track chronogically when the user's working directory changed.

I also noticed that CWD changes also doesn't update the `workspace.yaml` anymore, and it keeps pointing to a incorrect previous CWD.

### Affected version

v1.0.49-1

### Steps to reproduce the behavior

1. Resume any existing session in a git branch
2. Perform `/cwd new-path`
3. Both sessions-id/workspace.yaml + events.jsonl won't reflect the change

### Expected behavior

- workspace.yaml
cwd: new-path

- events.jsonl
`{"type":"session.context_changed","data":...}`

### Additional context

_No response_

Start by tracing the `/cwd new-path` command and how it updates `workspace.yaml` and `events.jsonl`. Reproduce the issue by resuming a session in a git branch, then run `/cwd new-path`. Done means `workspace.yaml` records the new cwd and `events.jsonl` contains a `session.context_changed` event.

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