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Rewrite sprintf_test to work in the repo's freestanding (-nostdlib)
environment and conform to the cocotb test harness contract.
- Replace stdio.h calls (fputs, putc) with uart_puts/uart_putchar
- Emit <<PASS>>/<<FAIL>> markers and halt loop per sw/README.md contract
- Add -lgcc to link 64-bit division builtins needed by sprintf.c on RV32
- Fix size_t test case that assumed 64-bit (RV32 truncated to zero)
- Fix copy-pasted Makefile comment ("Memory Test" -> sprintf test)
- Register sprintf_test in TEST_REGISTRY (tests/test_run_cocotb.py)
- Add SPRINTF_TEST_MAX_CYCLES (2M) for FP-heavy test suite
- Document sprintf library and test app in sw/README.md
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