Benchmark against Jinja

[Tronic]

Includes a benchmark script, with results updated on README.

Generated HTML length:  45230 bytes (Jinja 66772 bytes)
Product items on page:  100

Single page render time (averaged over 1000 renders):
  Full generation:                 1.248 ms  (12 µs/item)
  Full generation w/ selectors:    1.521 ms  (15 µs/item)
  Template:                        0.204 ms  ( 2 µs/item)

Jinja for comparison:
  Template file:                   0.896 ms  ( 9 µs/item)
  Template preloaded:              0.234 ms  ( 2 µs/item)

Templating is 6.1x faster than from-scratch generation, and 1.2x faster than Jinja (preloaded; 4.4x file).

[Copilot]

Pull request overview

Adds a benchmarking workflow to compare html5tagger’s templating performance against Jinja and documents the observed results in the README.

Changes:

• Extend scripts/benchmark.py to optionally benchmark equivalent rendering via Jinja (preloaded vs template-loaded-per-call).
• Add a new “Performance” section to README.md summarizing benchmark results and interpretation.
• Add a benchmark dependency group (Jinja2) and adjust metadata keywords.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
scripts/benchmark.py	Adds Jinja-based benchmarks and updates benchmark output formatting/instructions.
README.md	Documents benchmark results and adds a performance discussion section.
pyproject.toml	Adds a benchmark dependency group (jinja2) and updates keywords/formatting.

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