[InterNetNews/inn] 3dac52: Harden tradindexed index and search ownership

[Kevin Bowling]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 3dac52aff8f0260b7d8ee6061dd3ef82c3103f49
      https://github.com/InterNetNews/inn/commit/3dac52aff8f0260b7d8ee6061dd3ef82c3103f49
  Author: Kevin Bowling <kevin.bowling at kev009.com>
  Date:   2026-08-04 (Tue, 04 Aug 2026)

  Changed paths:
    M storage/tradindexed/tdx-data.c
    M storage/tradindexed/tdx-group.c
    M storage/tradindexed/tdx-util.c

  Log Message:
  -----------
  Harden tradindexed index and search ownership

Validate hash chains and freelist records before dereferencing them,
bound traversal cycles, and preserve cleanup on dump failures.  Close
expiration searches without freeing caller-owned data, avoid retrying
an indeterminate descriptor after close failure, and release utility
and audit owners on every exit.

see #371



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