feat: add turbo/normal modes for TAP catch-up
- `just turbo`: 4GB, 2 CPUs, higher parallelism for fast catch-up
- `just normal`: 2GB, 1 CPU, conservative settings for steady-state
uses fly machine update to change settings without full deploy
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>