chore: bump version to 0.9.1 (#21)

## Summary
- Patch version bump `0.9.0` → `0.9.1` to release text-to-speech for
received messages (#20)

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: mldangelo

src/crabcode

@@ -27,7 +27,7 @@
 
 set -e
 
-VERSION="0.9.0"
+VERSION="0.9.1"
 CONFIG_DIR="$HOME/.crabcode"
 CONFIG_FILE="$CONFIG_DIR/config.yaml"
 WIP_BASE="$CONFIG_DIR/wip"