Improve question detection, capture stealth, latency; stop tracking model binaries

- Detection: broaden request-starters, handle contractions, allow 1-word '?'
- Audio: PTT pre-roll (no clipped first word), drop Whisper silence hallucinations,
  greedy decoding + domain initial_prompt for faster/cleaner transcription
- AI: cap spoken-answer tokens so replies return at conversational speed
- Overlay: answers persist (no auto-hide); wire Ctrl+Shift+H show/hide toggle
- Screen capture: freeze-frame at hotkey press (immune to focus-blur lockouts),
  hide selector from screen-share (NSWindowSharingNone), higher capture resolution
- Stop tracking models/ and *.zip (large binaries; add to .gitignore)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

run.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$SCRIPT_DIR"
+
+echo "🎙️  Starting Meeting Assistant..."
+
+# Use the corporate-aware CA bundle (system + corporate + public CAs) so model
+# downloads / revalidation work behind SSL-inspecting proxies. See README.
+if [ -f "certs/corp_ca_bundle.pem" ]; then
+    export SSL_CERT_FILE="$SCRIPT_DIR/certs/corp_ca_bundle.pem"
+    export REQUESTS_CA_BUNDLE="$SSL_CERT_FILE"
+    export CURL_CA_BUNDLE="$SSL_CERT_FILE"
+fi
+# hf-xet has been flaky behind proxies; plain HTTPS transfers are more reliable.
+export HF_HUB_DISABLE_XET=1
+
+# Activate virtual environment
+if [ -d ".venv" ]; then
+    source .venv/bin/activate
+    echo "✅ Using virtual environment: .venv"
+else
+    echo "⚠️  No .venv found — using system Python"
+    echo "   Run: python3 -m venv .venv && source .venv/bin/activate && pip install -r requirements.txt"
+fi
+
+# Install PortAudio if needed (macOS)
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    if command -v brew &> /dev/null && ! brew list portaudio &> /dev/null 2>&1; then
+        echo "📦 Installing PortAudio via Homebrew..."
+        brew install portaudio
+    fi
+fi
+
+python3 main.py