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Release receipt printing latency fix - #1395
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Ready Windows printers could wait up to 30 seconds for a separate initialization or idle job before receiving the receipt. Send the receipt, which already starts with ESC @, immediately after readiness checks. Preserve offline recovery, printer identity checks, per-printer serialization and duplicate protection.
Fast receipt now converts GBP/EUR symbols to printable currency codes instead of silently switching to image rendering.
Validation: 139 targeted tests passed; four delay regressions fail on the original code and pass with the fix. Six real Electron renders (58/80 mm, 12 strips each) completed in 271–526 ms. These timings cover rendering only, not physical printing. Client installation and device verification are still pending.