Two code paths call json.loads() on output from external tools without
catching JSONDecodeError. If the tool returns a non-JSON string (error
message, empty string, or None), the entire call path crashes.
1. gateway/run.py — text_to_speech_tool() result in voice reply path.
A TTS failure that returns an error string instead of JSON crashes
the voice reply handler, killing the message response entirely.
2. cron/scheduler.py — skill_view() result when loading skills for
cron jobs. A corrupted or missing skill file that returns an error
string instead of JSON crashes the cron tick, preventing all jobs
from executing that cycle.
Both fixes catch (json.JSONDecodeError, TypeError), log a warning,
and gracefully skip the failed operation instead of crashing.
2b538c1f4e