Add multilingual language and systems learning tracks

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+<!doctype html><html lang="en"><meta charset="utf-8"><title>Source, machine code, and ISA</title><h1>Source, machine code, and ISA</h1><p>15-minute session: read for 3 minutes, trace for 3, experiment for 7, and complete the check for 2. Spend longer whenever you need.</p><p>A CPU executes instructions from its instruction-set architecture (ISA). Source text needs a compiler or interpreter. The same Python source may work on x86-64 and Arm64 when each has a compatible interpreter; a compiled x86-64 executable is a different artifact. Print the lab machine’s architecture, then write a table separating source language, ISA, operating system, and runtime. An emulator implements another machine’s behavior and is not the same as recompilation.</p><pre><code class="language-python">import platform
+print(platform.machine())
+</code></pre><h3>Practice and evidence</h3><p>Keep three notes: your prediction, the actual result, and why they match or differ. The completion check grades understanding; the practice task builds skill.</p><p><a href="https://www.intel.com/content/www/us/en/developer/articles/technical/intel-sdm.html">Language reference: www.intel.com</a></p><p><a href="https://developer.arm.com/Architectures/Learn%20the%20Architecture">Language reference: developer.arm.com</a></p><p><a href="https://docs.riscv.org/">Language reference: docs.riscv.org</a></p></html>