fix(deepseek): review fixes for the transcript reader — docker/remote gate, poll memo, honest pairing docs

Four review findings on the worker-transcript feature:

- Docker and remote-SSH dsh sessions now keep the pane segmenter: their
  transcripts live in the container's / remote host's own ~/.dsh, which
  the local reader can never see, so the transcript path returned
  'nothing said yet' forever and an agent polling such a worker starved
  on an answer that existed. Gated on !session.docker && !session.remote
  (statically pinned) and documented in the integration guide.

- last-response reads are memoized on (path, mtime, size, blocks): the
  skill's last_text polls once per second, and each poll decompressed and
  reparsed the whole file on the event loop even when nothing had been
  appended. An unchanged poll now costs one stat.

- The pairing ladder's comment claimed /new is served by step 2; in truth
  the boot-window transcript wins for as long as it exists (deliberately:
  preferring newest-eligible would hand a worker its busier sibling's
  reply). The comment now states the real tradeoff instead of the
  aspirational one. Same for decodeZstdFrames' 'skipped' wording — a
  corrupt frame truncates the decode there, which is the safe behavior.

- stripReasoningPrefix no longer runs on user prompt text, so a prompt
  containing a literal </think> renders whole in blocks view.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/deepseek-integration.md

@@ -223,6 +223,12 @@ reader (`src/deepseek-transcript.ts`):
   which is returned as `Turn error: …` (and an early stop such as `max-tokens` as
   `Turn ended: …`) instead of an empty string that reads as "still thinking".
 
+The transcript reader applies to **local** dsh sessions only. A Docker case's
+harness writes its transcript inside the container's own `~/.dsh` (the workspace
+bind mount does not cover it), and a remote-SSH case's lives on the remote host,
+so the local reader could never find those files — such sessions keep the pane
+segmenter, coarse but real. The splash caveat above applies to them accordingly.
+
 ### As an agent worker
 
 Because dsh has both halves — a real end-of-turn signal and a real transcript — an