feat: append mode for MetricWriter.open#54

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feat/metric-writer-append-mode

Commits on Jun 24, 2026

feat: add write_header arg to MetricWriter.__init__

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feat: add append mode to MetricWriter.open

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test: cover MetricWriter append round-trip across compression formats

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doc: changelog entry for MetricWriter append mode

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refactor: extract append-header decision out of open()

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refactor: read existing header via DictReader.fieldnames

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fix: write header when appending to an empty compressed file

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refactor: simplify append-mode header helpers

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Commits on Jun 25, 2026

feat: accept headerless data files when appending

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