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979a66360b
Introduce atomic-snapshot persistence types that will replace the current fine-grained 13-proc Persistence interface. This commit is purely additive: no existing call site changes, no behaviour change. New types (sds/types/): - channel_meta.nim — ChannelMeta (atomic per-channel snapshot blob), ChannelData (bootstrap payload), OutgoingRepairKV / IncomingRepairKV (flattened map entries for protobuf wire shape). - history_update.nim — HistoryUpdate (combined append/evict payload for the message log). New codec (sds/snapshot_codec.nim): - Protobuf encode/decode for all new types, reusing the existing SdsMessage and HistoryEntry encoders from sds/protobuf.nim. - Explicit schemaVersion=1 on ChannelMeta; decoder rejects unknown versions loudly rather than silently truncating. - Time encoded as int64 unix milliseconds. Tests (tests/test_snapshot_codec.nim): - 13 round-trip cases covering empty, single-entry, full-buffer, and repair-heavy snapshots; ChannelData ordering; HistoryUpdate variants; schemaVersion rejection. Planning artefacts: - ANALYSIS_SDS_PERSISTENCE.md — problem statement (partial-write divergence, chatty call rate, non-fatal-error policy gap). - ANALYSIS_SNAPSHOT_SAVE_POINTS.md — exact save points per protocol op and projected call rates. - PLAN_SNAPSHOT_PERSISTENCE.md — phased refactor plan; this commit implements phase 0. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>