v1.29.5 — stdlib helpers stop warning about their own internals

Extension 1.29.5 / mcp-server 1.29.5.

Fixed

• Stdlib helpers no longer warn about their own internals.
  holes.counterbore used through patterns.cutAt printed
  "fuse #N: fuse produced no new material" once per placement, and placeOn
  raised the extrude-plane hint whose recommended fix is placeOn itself.
  The hint told user code from stdlib code by looking for /stdlib/ in the
  call stack, which is only true when core runs from source. Once bundled
  (the worker, the MCP server, the website), every helper looked like user
  code. Stdlib construction now runs inside an explicit internal scope that
  the no-op fuse guard, the extrude-plane hint and the pen-axis advisory
  respect. It covers placeOn, extrudeCentered, holes.counterbore,
  holes.teardrop, bearings.seat and the motor mount plates. Internal fuses
  no longer use up the user's fuse #N numbers.
• holes.counterbore on a plate too thin for the head. When the head
  pocket is as deep as the plate (M4 in 4 mm: the pocket is 4.2 mm deep), the
  pocket cuts straight through and the screw head has nothing to seat on. It
  now says that once, instead of emitting a no-op fuse warning per hole. The
  cut geometry is unchanged.