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Andrew Hundt
cf4d3b2220
Previously, semantic pair fixtures ran only in synthetic repositories. A large-background run could copy ambient dirty files or duplicate this repository's tracked benchmark canaries, making cross-version quality and performance results neither isolated nor commit-auditable. Add quality_background repo/revision/tree matrix identity and pass the exact commit to benchmark-incremental-speed.py. Materialize only tracked files with git archive, exclude dirty and untracked source state plus the benchmark task-definition subtree before overlaying one canary copy, safely validate archive paths, remove the transient archive, and retain source commit, tree, dirty status, exclusions, and copy policy. Campaign result validation rejects missing or mismatched background commit/tree identity. The copy uses one Git archive process and linear extraction instead of one Git process per file. Runtime is O(tracked archive bytes + files), memory is bounded by tar metadata, and the source checkout/worktree registry is never modified. Verification: uv run python -m unittest tests.test_benchmark_campaign tests.test_benchmark_incremental_speed (76 passed); Ruff checks; git diff --check. The Git fixture proves committed VERSION=1 is copied while dirty VERSION=2, an untracked file, and tracked benchmarks/semantic-pairs-v1 canaries are excluded; campaign tests bind resolved path plus full commit/tree hashes and reject a retained revision mismatch. Signed-off-by: Andrew Hundt <ATHundt@gmail.com>