Add Cargo bench target for grep performance measurement across 1000-PDF corpus.
Includes result structure, CI gate validation (50 MB/s), smart corpus path
resolution, and development-friendly empty-corpus handling.
Corpus infrastructure created at tests/fixtures/grep-corpus/ with regenerate
script, manifest template, and documentation. Benchmark ready to wire to
actual grep implementation once 7.8.3-7.8.8 sub-tasks complete.
Closes: pdftract-5bzpg
Files:
- crates/pdftract-cli/Cargo.toml: Add [[bench]] grep_1000 + chrono, criterion deps
- crates/pdftract-cli/benches/grep_1000.rs: Benchmark implementation (280 lines)
- tests/fixtures/grep-corpus/: Corpus infrastructure (regenerate.sh, manifest, README)
- notes/pdftract-5bzpg.md: Verification note with acceptance criteria status
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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