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docs: design the D4 metadata sidecar - #14
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Records the contract before any code: a new write_ex entry carries the sample format (old write() stays byte-identical for HAL), sidecars are per .pcm file, written once at open and finalized at every close, and the feature is off by default so Android HAL behaviour is unchanged. Covers failure modes, JSON escaping, the LRU interaction that forces the hook into file_mgr, and a nine-case test plan.
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D4 的设计草案，先定契约再写码。
核心决定：
文档里包含对 Android HAL 的影响逐项核对表、JSON schema 与转义规则、失败矩阵、S-01~S-09 测试计划，以及 D4-A/B/C 三步拆分（A 可独立合入、行为等价）。
有两个待确认项写在最后：key 非 UTF-8 时是否改 base64；开关是否允许运行时切换。