## Why
When several Teams meetings are plausible in Outlook, a standalone "current meeting" lookup can pick the wrong appointment or no appointment. The recording-start notification already represents one specific cached calendar meeting, so accepting that notification should start the recording with that meeting's metadata.

## What Changes
- Carry meeting title, attendees, agenda, and scheduled end in cached calendar prompt candidates.
- Start recordings accepted from a meeting-start notification with the accepted candidate's metadata instead of running a separate Outlook current-meeting lookup.
- Preserve the normal workflow lifecycle events and rules for prompted starts.
- Exclude canceled Outlook appointments from prompt candidates and standalone current-meeting metadata lookup.

## Impact
- Updates the calendar prompt scheduler and recording controller seam.
- Extends Windows Outlook calendar prompt extraction to include metadata already used by meeting notes.
- Filters canceled Outlook appointments before prompting or selecting metadata.
- Adds tests for prompt-supplied metadata and workflow rule execution.