contextlake 8.10.1

Fixed

• kb index --workspace no longer breaks its worker pool. The cause was
  RepoTooLarge, the exception 8.10.0 added for the memory budget: it could not be
  unpickled. A worker that refuses a repository sends the exception back to the parent,
  and Python rebuilds an exception as cls(*args), where args held only the formatted
  message this class passes to Exception.__init__. The rebuild was three arguments
  short and raised TypeError inside ProcessPoolExecutor's manager thread, which has
  no future to attribute a failure to, so it broke the whole executor: every healthy
  worker was sent SIGTERM and every pending repository failed with A process in the process pool was terminated abruptly. One refused repository ended a 656-repository
  run in about a minute.

  pickle.dumps succeeded on the exception throughout. Only the parent's unpickle
  failed, which is why nothing caught it. The same 17-repository cluster that broke the
  pool twice now completes at --workers 4 with 0 failures, the over-budget repository
  reported as a skip, and all four workers exiting 0.

• Five more exceptions had the same defect and are fixed with it.
  GrammarNotInstalled is raised on the same indexing path and would break a pool the
  same way when an optional grammar is absent. McpToolError, CircuitOpenError,
  StoreBusy and RunBusy are off that path today. Every exception in the package that
  defines its own __init__ now defines __reduce__, and a test walks the package to
  assert each one survives a round trip, so the next one cannot ship without a sample.

• A broken worker pool now falls back to serial indexing. That fallback was written
  for this failure and was unreachable: BrokenProcessPool subclasses RuntimeError, so
  the per-repository except Exception caught it, counted one failure against whichever
  repository raised it, and continued, and the handler that re-runs the work-list serially
  never ran once. The failure counters are reset before the serial pass, so a repository
  that genuinely failed before the break is not counted again by it.

• The reason a pool broke is now reported. str(BrokenProcessPool) is a fixed
  sentence naming no cause, and the real reason is attached as __cause__, which was
  discarded. Reporting only the fixed sentence is why three candidate causes stayed
  unseparated across several investigations.