Name output accessors after socket names and generate shader Attribute

[BradyAJohnston]

Generated o.<name> attributes now use the socket's display name (falling back to the identifier when a name is shared), matching what to_python writes, e.g. o.fac → o.factor, Points().o.points, Selection().o.boolean. Old identifier names still resolve at runtime.

The shader Attribute node is now generated instead of hand-written, with a customization keeping attribute_name positional in its factories.

[codspeed]

Merging this PR will not alter performance

⚠️ 2 benchmarks spent significant time in system calls

System calls cannot be consistently instrumented, so they are not included in the measure, which understates the real cost. Please switch to the Walltime instrument to accurately measure system calls.

Measurement and system calls

• test_build_readme_tree_no_arrange
• test_arrange_decoder_4bit[sugiyama]

✅ 15 untouched benchmarks

---

_{Comparing output-names-from-socket-names (9931175) with main (927e458)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.30%. Comparing base (927e458) to head (9931175).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #269      +/-   ##
==========================================
- Coverage   98.31%   98.30%   -0.01%     
==========================================
  Files         106      106              
  Lines       31175    31175              
==========================================
- Hits        30649    30648       -1     
- Misses        526      527       +1     

☔ View full report in Codecov by Harness.
📢 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.