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Add interrupts module: INT 3 (CC breakpoint) vs INT 21h (DOS services)

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NASM sources, DOSBox/FreeDOS Debug/Unicorn harness, captured output and 31
assertions backing the ankurm.com article "INT 3 vs INT 21h in 8086 Assembly".

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01KqJyCidz3ZgRyHABv2GVJh
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asmhatre
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co-authored by Claude Sonnet 5.5
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# 8086-Programs
Runnable companion code for the 8086 assembly articles on [ankurm.com](https://ankurm.com/).
Each topic lives in its own directory with its sources, a script that rebuilds everything, and the captured output the article quotes.
| Module | What it covers | Article |
|---|---|---|
| [`interrupts/`](interrupts/) | `INT 3` (the `CC` breakpoint) versus `INT 21h` (DOS services chosen by `AH`): opcode bytes, stack frame, DEBUG behaviour, INT 21h function tour | [INT 3 vs INT 21h in 8086 Assembly](https://ankurm.com/understanding-int-3h-vs-int-21h-in-8086-assembly/) |