[InterNetNews/inn] e66875: Validate buffindexed group index mappings

[Kevin Bowling]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: e66875f7f9a9609ff3dbd7e24eb2d0d05b774b1c
      https://github.com/InterNetNews/inn/commit/e66875f7f9a9609ff3dbd7e24eb2d0d05b774b1c
  Author: Kevin Bowling <kevin.bowling at kev009.com>
  Date:   2026-08-13 (Thu, 13 Aug 2026)

  Changed paths:
    M storage/buffindexed/buffindexed.c
    M tests/overview/overview-t.c

  Log Message:
  -----------
  Validate buffindexed group index mappings

Reject unrepresentable or partial group.index files, preserve the
current mapping until replacements succeed, propagate lookup failures,
and support read-only remapping after concurrent growth.

see #372



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