Aggregate AVR lec10 + lec11_12 examples into two traceable source files

[Copilot]

This change consolidates all AVR examples from AVR/lec_10_examples and AVR/lec_11_12_examples into exactly two files—one assembly and one C—while preserving per-exercise context inline. The goal is to keep historical task intent visible without keeping many fragmented source files.

• Scope

  • Added:
    • AVR/exams_aggr.asm
    • AVR/exams_aggr.c
  • Removed all original *.asm / *.c files from:
    • AVR/lec_10_examples
    • AVR/lec_11_12_examples

• Aggregation behavior

  • AVR/exams_aggr.asm contains every source .asm from both sets, in order.
  • AVR/exams_aggr.c contains every source .c from both sets, in order.
  • Each appended file is preceded by a trace header using the required comment style:
    • ASM: ; ...
    • C: /* ... */

• Traceability format

  ; ==========================================================
  ; Source file: AVR/lec_10_examples/lec10_1.asm
  ; ==========================================================

  /* ==========================================================
   * Source file: AVR/lec_11_12_examples/int0_handling.c
   * ========================================================== */

[dionysakos]

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