v0.6.0 - Console I/O System Calls

New Features

Console I/O System Calls

• Add SYS_EMIT (0x30) - Output one character ( c -- )
• Add SYS_KEY (0x31) - Input one character ( -- c )
• Console I/O range reserved: 0x30-0x3F

HAL API Extensions

• Add v4_hal_putc(char c) for character output
• Add v4_hal_getc(char *out_c) for character input
• Implement HAL wrapper bridge in src/hal_wrapper.cpp

Mock HAL Enhancements

• Add console I/O mock with input injection and output capture
• mock_hal_console_inject_input() for testing input
• mock_hal_console_get_output() for verifying output

Tests

• Add 3 new test cases for SYS_EMIT and SYS_KEY
• All tests pass (13/13 with 46 assertions)

Implementation Details

• SYS_EMIT: Pops character from data stack, outputs via HAL
• SYS_KEY: Reads character from HAL, pushes to data stack with error code
• Blocking I/O: v4_hal_getc() blocks until data available

Full Changelog

• Add Console I/O SYS instructions (EMIT and KEY) (d99af3b)

Dependencies

• Requires V4-hal >= 0.2.0 for console I/O support