Task 1a — Expose confidence score from listener.py when transcript is rejected

Task 1a — Expose confidence score on low-confidence rejection

Part of Task 1: Low Confidence Voice Feedback.

What to do

In src/jarvis/listening/listener.py, find where Whisper transcripts are filtered out due to low confidence (currently logs 🔇 Low confidence (x.xx): ...).

• Extract the confidence value and the reason for rejection into a structured object or named return value (e.g. a LowConfidenceEvent dataclass or a dict {"confidence": float, "transcript": str}).
• Emit or return this event so downstream code (reply engine, output layer) can react to it.
• Do not change any TTS or UI behaviour yet — this subtask is purely about surfacing the data.

Files to touch

• src/jarvis/listening/listener.py

Acceptance criteria

• Low-confidence rejection produces a structured event/value (not just a log line)
• The confidence score and raw transcript are both accessible from outside the listener
• Existing behaviour is unchanged (nothing new is spoken or displayed yet)