bench(deps-go): add comprehensive benchmarks for Go ecosystem

[bug-ops]

Summary

• Add criterion benchmarks for deps-go crate covering all major operations
• Document performance targets based on LSP latency requirements

Benchmark Coverage

Group	Tests
go_mod_parsing	small (5 deps), medium (25 deps), large (100 deps), complex
go_sum_parsing	small, medium, large
position_tracking	single require, block, replace directive
version_comparison	simple, incompatible suffix, pseudo-version, find latest
pseudo_version_detection	regular, pseudo, with base, incompatible, prerelease
module_path_escaping	lowercase, uppercase, mixed, special chars, long path
directive_types	require inline/block, replace, exclude, indirect, pseudo, incompatible
comment_handling	parsing with inline and block comments
unicode_parsing	Unicode in comments and module declarations
go_sum_special_cases	pseudo-version, incompatible, duplicate versions

Performance Targets

From docstring:

• Parsing small files: < 1ms
• Parsing medium files (20-50 deps): < 5ms
• Parsing large files (100+ deps): < 20ms
• go.sum parsing: < 10ms for 100 entries
• Version comparison: < 10μs per operation
• Module path escaping: < 1μs per operation

Test plan

• cargo build --workspace --benches passes
• CI benchmark build check passes
• Run cargo bench -p deps-go to verify benchmarks execute

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main      #44   +/-   ##
=======================================
  Coverage   85.73%   85.73%           
=======================================
  Files          55       55           
  Lines       14642    14642           
=======================================
  Hits        12554    12554           
  Misses       2088     2088           

Flag	Coverage Δ
deps-cargo	79.31% <ø> (ø)
deps-core	90.99% <ø> (ø)
deps-go	85.73% <ø> (ø)
deps-lsp	79.54% <ø> (ø)
deps-npm	89.55% <ø> (ø)
deps-pypi	86.69% <ø> (ø)
overall	85.73% <ø> (ø)

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