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

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
2026-09-30 19:10:56 +00:00
commit 09af523f8c
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+clean run, no breakpoint:
+         CX=3
+
+CC       patch=CC     trap: vector=3 return IP=7C03 (site=7C02, +1)  debugger restores IP=7C02
+         after resume: CX=3 (expected 3), final IP=7C05
+CD 03    patch=CD03   trap: vector=3 return IP=7C04 (site=7C02, +2)  debugger restores IP=7C03
+         after resume: CX=0 (expected 3), final IP=7C64
+
+RESULT: PASS