docs: consolidate design documentation and standardize crate English

2026-10-12 14:58:00 +09:00
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+# project-record
+
+Provides timestamp encoding, validation, and collision-aware candidate allocation for record IDs.
+The caller owns record persistence and concurrency control for writes.
+
+## Main entry points
+
+- [`encode_unix_epoch_millis`], [`decode_unix_epoch_millis`]: fixed-width ID conversion
+- [`allocate_record_id`]: candidate selection avoiding existing IDs