- communication.md: replace the Mermaid state diagram with a plain-text
diagram (Mermaid showed 'Error rendering embedded code' on GitHub)
- regenerate psblas-3.9.pdf as PDF 1.5 (matching the previous build)
instead of TeX Live 2026's default 1.7, which GitHub's viewer failed
to load
- psb_halo: document tran and mode arguments; note work is array-only
- psb_ovrl: document mode argument
- add psb_comm_status_{sync,start,wait}_ to the Named Constants list
- fix psb_add_ -> psb_sum_ in the psb_ovrl update operator list
- remove duplicated psb_gather synopsis line
- drop spurious alpha from the psb_halo data-type table header
- regenerate psblas-3.9.pdf
Stack-1
sfilippone
Salvatore Filippone