Reviewed src/providers/dsh.ts against deepseek-harness @ 99f6f02f and fixed
what the format says but the parser did not:
- A forked session's log replays its parent's events verbatim, and codeburn
parses the parent's own log as its own session, so every inherited call was
billed twice. The header's parentSession + seedLength mark that prefix;
events with seq < seedLength are now skipped.
- The model now comes from the reporting assistant/message's own
message.source, which is what actually served the step. request/header only
describes the request DSH was about to make, and is the fallback.
- user/message also carries agent-injected context (runtime snapshots, skill
bodies) under source.kind 'plugin'; only a typed prompt becomes the preview,
and it is bounded to 500 chars like every other provider rather than holding
a whole injected system prompt per turn.
- A log stamped with a session format version other than 0 is skipped with a
notice. The format is pinned at 0 upstream with no compatibility implied, so
reading a bumped format under today's assumptions would report confident
wrong numbers.
- Timestamps go through the seconds-vs-milliseconds guard and fall back to the
header createdAt, so a call can no longer carry an empty timestamp and land
in the undated cache shard.
- The compressed read buffers the whole log to scan its frames, so it now takes
the same oversize guard readSessionFile applies to the uncompressed variant.
- The zstd-unavailable notice fired once per session log; each distinct notice
is now emitted once.
- Emit workingDirectory beside projectPath, as codex does.
Tests add the upstream examples/acp-agent snapshot as a fixture, covering the
real record shapes: packed reasoning-chunks/tool-call-chunks storage rows, a
plugin-injected user/message beside the typed one, and both the streamed usage
chunk and the final assistant/message usage for the same step. Plus the same
snapshot re-encoded as multi-frame zstd with a torn tail (identical output), a
forked session, an unsupported format version, and unparsable lines.
