Add -C/--comment-column for inline comment alignment

[jamarju]

Summary

• Adds -C/--comment-column flag to control where inline (tail) comments are aligned (default: 24 for backward compatibility)
• Fixes grammar so inline comments on constant_def and control_command lines are parsed separately and aligned like all other inline comments
• Guarantees at least one space between code and comment even when the code exceeds the target column

Example

# Before (hardcoded column 24, equate comments not aligned):
human_color = $15            ; color the human is playing
scoreL_stack = $23            ; score stack low bytes

# After with -C 41:
human_color = $15                       ; color the human is playing
scoreL_stack = $23                      ; score stack low bytes
        lda #$a0                        ; PETSCII space character

Test plan

• Verify default behavior unchanged (column 24)
• Verify -C 41 aligns all inline comments at column 41
• Verify comments on .byte, .word, .org and = lines are aligned
• Verify at least 1 space of padding when code exceeds target column

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