add description to lgdo attrs

[ggmarshall]

Closes #194

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.40%. Comparing base (fea1310) to head (caec424).
⚠️ Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
+ Coverage   64.35%   64.40%   +0.05%     
==========================================
  Files          61       61              
  Lines        4009     4015       +6     
==========================================
+ Hits         2580     2586       +6     
  Misses       1429     1429              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Copilot]

Pull request overview

Propagates the optional description field from a processor recipe into the output LGDO buffer's attributes, so descriptions defined in DSP configs are persisted in output files (closes #194).

Changes:

• When linking output buffers, copy a recipe-level description value into buf_out.attrs["description"] if present.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[iguinn]

Thanks George, can you also throw a quick test into test_build_dsp? I think adding a description to at least one of the processors in tests/configs, checking that it shows up in attrs, and checking that nothing shows up in one without is all that's needed.