Benchmark text wrapping workflows

[joshka]

Summary

• compare native Paragraph wrapping with ParagraphCompat, first-fit, and optimal-fit
• cover counting, fresh rendering, repeated frames, resizing, caching, and scrolled viewports
• add deterministic mixed-text fixtures plus opt-in stress and allocation diagnostics
• check in benchmark documentation, a report generator, and an initial measured baseline

The compatibility preflight verifies that native Paragraph and ParagraphCompat produce matching
line counts and rendered buffers. Their timing delta therefore captures the cost of full owned
materialization rather than different wrapping semantics.

Validation

• cargo bench -p ratatui-textwrap --bench textwrap-workflows -- --test
• cargo bench -p ratatui-textwrap --bench textwrap-stress -- --test
• complete core Criterion measurement
• complete allocation diagnostic
• cargo test --workspace --all-features
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• cargo fmt --all -- --check
• markdownlint-cli2 'crates/ratatui-textwrap/**/*.md'

After rebasing onto current main, the focused ratatui-textwrap tests, Clippy, formatting, and
Markdown checks were rerun successfully.