Add home voice command brainstorm to ideas folder

ideas/voice-commands.md

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+# Home Voice Command Ideas
+
+## Option 1: All-in-one Mac mini
+- Mac mini runs hotword detection (Porcupine)
+- Records and transcribes with Whisper/Vosk
+- Bro answers out loud via speakers
+
+## Option 2: Pi + Mac combo
+- Pi listens for hotword, records voice
+- Pi sends audio file to Mac mini
+- Mac mini transcribes and answers out loud
+
+## Pi Benefits
+- Multi-room coverage (add more Pis)
+- Offloads always-on listening from Mac mini
+
+## Mac mini Advantages
+- Faster transcription
+- Central "house voice" for replies
+
+---
+
+Both setups can trigger Bro for smart, out-loud answers anywhere in the house.