Speed up symlink following with optional concurrency#184

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Commits on May 4, 2026

Speed up symlink following with optional concurrency
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Defer concurrency state save until after option validation
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Add E2E benchmark for symlink-follow concurrency
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Bump symlink-follow benchmark to 74 symlinks behind a 5s server delay
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Move benchmark delay server off the registered nginx port
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Make benchmark delay server proxy to nginx instead of re-bootstrapping the plugin
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Inject benchmark delay via an mu-plugin instead of a reverse proxy
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Track max in-flight server requests in the symlink-follow benchmark
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Run symlink-follow concurrency through real curl_multi
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Skip the symlink-follow benchmark under Playground CLI
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Always follow symlinks through the curl_multi pool, with resume sidecars
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Defer pool errors until the curl_multi drain pass finishes
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Drain in-flight transfers before throwing on a pool error
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Preserve original slot ids and visited dirs when resuming the symlink pool
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Trace symlink-pool restore + persist in the audit log
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Surface pool resume/persist trace via output_progress
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Declare symlink_pool in default_state so save_state stops dropping it
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