DO NOT MERGE: running perf on #262

[thetayloredman]

• Initial plan
• feat: add comprehensive performance benchmarking infrastructure
• feat: add GitHub Actions benchmark workflow and expand benchmark suite
• fix: correct benchmark workflow to properly compare PR vs base branch
• perf: optimize benchmark workflow to run only twice and reuse cache
• fix: improve benchmark output detection and add debug fallback
• fix: remove conflicting --save-baseline flag from comparison run
• feat: improve benchmark report formatting with table view and artifact link
• feat: use diff-style formatting for benchmark results with explanation
• feat: only highlight benchmark changes ≥5% in diff format
• fix: correct diff color mapping - slower benchmarks now show in red
• feat: tagged unions (enum) and pattern matching, wip
• update to use new span modes
• impl display
• stash

[github-actions]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.25%. Comparing base (ab9fb63) to head (4995d49).

Additional details and impacted files

@@            Coverage Diff            @@
##           feat/176     #395   +/-   ##
=========================================
  Coverage     58.25%   58.25%           
=========================================
  Files            46       46           
  Lines          3878     3878           
=========================================
  Hits           2259     2259           
  Misses         1619     1619           

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