fix(edit-history): remote reads get time for their size, follow CLAUDE_CONFIG_DIR, keep the conversation after /clear

Review findings on the remote edit history:

- A forward read may carry 13 MiB and "Load older" 29 MiB; the flat 30 s
  read timeout cut those off below ~1 MiB/s. The timeout now adds the
  transfer time at 256 KiB/s (remoteEditSourcesTimeoutMs). It ends a hung
  read, it does not cut a slow one.
- The transcript lookup looked only under $HOME/.claude. It now uses an
  absolute CLAUDE_CONFIG_DIR of the ssh command's environment, else
  $HOME/.claude, for both the projects and the live sessions/<pid>.json.
  A value set only in .zshrc stays invisible (the lookup is a plain sh);
  documented, and the panel's remote no-transcript note says so instead
  of promising the next prompt (a remote host sends no hooks).
- After a remote /clear claudeSessionId stays the launch id, so once the
  remote claude exited the lookup fell back to the cleared conversation
  and the panel flipped back. The sync now hands the lookup the stored
  conversation, tried right after the live one (remoteTranscriptIds).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/wiki/Working-With-Files.md

@@ -324,8 +324,9 @@ How it reads:
   directory. A `CLAUDE_CONFIG_DIR` set outside Codeman (in a shell profile or a wrapper script)
   is only known after the next prompt; until then the window says "No transcript found for this
   session yet". A remote session's transcript is looked up on its host over SSH: the
-  conversation its Claude writes now, else the session's own, under the remote user's
-  `~/.claude` (a `CLAUDE_CONFIG_DIR` on the remote host is not followed).
+  conversation its Claude writes now, else the one the window showed last, else the session's
+  own, under the remote user's `~/.claude`, or under `CLAUDE_CONFIG_DIR` when the host sets it
+  for every SSH command (`.zshenv`, `/etc/environment`); one set only in `.zshrc` is not seen.
 - **The history is stored, and it holds secrets.** Every diff an agent wrote is copied to
   `~/.codeman/edit-history/<session-id>.json`, including API keys or `.env` contents it edited. The file is
   readable by your user only, capped at 500 edits and 4 MiB of diff text per session (the oldest