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1 Commits (877058094ada64c2984be587069708318d81631a)

Author SHA1 Message Date
Stack-1 dad4d3b894 docs: add developer guide internals layer
Introduce docs/internals/ as a two-layer complement to the user manual:
- README.md: index plus the user-manual vs developer-guide rationale
- communication.md: the psb_halo/psb_ovrl -> psi_swapdata dispatch path,
  the psb_comm_handle_type hierarchy and factory, the five MPI schemes
  (isend/irecv, neighbor alltoallv, persistent, RMA pull/push), and the
  start/wait/sync swap-status state machine
3 days ago