Add git database locks and db_dir config#307

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Commits on May 28, 2026

sess: serialize concurrent git/db/checkout via filesystem locks

micprog
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claude
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config: add `db_dir` for sharing bare repos and locks across projects

micprog
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claude
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chore: address pre-existing clippy warnings

micprog
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claude
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Commits on May 29, 2026

config: read `db_dir` from `BENDER_DB_DIR` env var

micprog
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claude
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