fix(io): spit truncates on write and honours :append - #32
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file-mode returned FileMode/OpenOrCreate for every write, so an existing file was opened at position 0 without truncating, and :append was ignored. A plain write now opens with FileMode/Create and :append with FileMode/Append, matching JVM Clojure.
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Closes #30
file-modeopens a plain write withFileMode/Createand:appendwithFileMode/Append; it usedFileMode/OpenOrCreatefor every write, so old content survived past the new tail and:appendwas silently dropped.