Sync#185
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OyczE merged 2 commits intodevelopmentfrom May 4, 2026
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## Summary
- Adds `sd_status` UART command to JanOS (stat("/sdcard") only, no mount)
- Cardputer startup now sends `sd_status` instead of `list_sd`
- Removes 1000ms pre-delay and shrinks timeout from 3000ms to 500ms
- Worst-case startup SD check drops from ~21s (list_sd × 3 retries) to 500ms
feat: faster SD presence check via sd_status command
## Summary
- Adds `sd_status` UART command to JanOS (stat("/sdcard") only, no mount)
- Cardputer startup now sends `sd_status` instead of `list_sd`
- Removes 1000ms pre-delay and shrinks timeout from 3000ms to 500ms
- Worst-case startup SD check drops from ~21s (list_sd × 3 retries) to 500ms
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