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Encode atomic JSON once with compact default output - #31
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Closes #30. Default to compact parsed-equivalent metadata while retaining explicit indentation, locks, fsync and atomic replacement.
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Atomic JSON metadata updates now encode once with the stdlib encoder and write once, defaulting to compact JSON while preserving explicit indentation. The existing atomic owner retains lock/read/update/fsync/replace semantics and cleans up its temporary files when writes or replacement fail.
Closes #30.
Validation:13 focused atomic/lock checks pass, including parsed nested/unicode values, explicit formatting, transform/lock release, and encoding/fsync/replacement/update failures preserving the original file. Ruff, Black and diff checks pass.
A single saved genuine OpenHCS fixed12 Track metadata replay measured109.97ms→23.14ms for atomic parse/identity-update/write. This excludes projection/reconciliation, uses a standalone diagnostic pair, and is not an end-to-end benchmark claim. Default whitespace changes; explicit
indent=2preserves human-readable output.