2 commits, squashed; the originals stay reachable from tag archive/merge-main-develop.
- d63aa814f jyviko: threads: main's tapped-hole sizes and shaft turn-down on the reworked thread
- cfc393d68 jyviko: Main's new callers of the placing calls that now return their error
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DtL5M41G8Nua7HvuFPZkmJ