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Mirrors the miner.py fix in this same branch. convo_miner.py had the exact same 10 MB cap at line 58 that silently dropped long transcripts via continue. Long Claude Code sessions, multi-year ChatGPT exports, and lifetime Slack dumps all exceed 10 MB. Same silent-drop pattern, different file. Raised to 500 MB to match miner.py for consistency; downstream chunking means source file size does not affect storage or embedding cost. Tests: tests/test_convo_miner_size_cap.py (1 test) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>