Part of #92. The headers benilla writes at the top of a player's saved-variables files and chat cache carried a private record number, so every player's own files held one. They now say only what the file is.
- The chat cache's repair marker is now `# benilla-writer 2`. The check is `contains`, so a file stamped with the longer marker still counts as repaired and is not re-seeded.
- The other record numbers in these four files' literals go too: one log line and five assert messages. So does one test name, now `one_line_rows_without_addedversion_still_parse`.
- Every change is to string-literal text, proven with comments stripped and every literal masked, except the renamed test.
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
