audit(erdos-162): cycle 6 — same issue persists, mechanic PR #21488 still open

[rjwalters]

Summary

• Cycle 6 of erdos-162 audit. Issue identical to cycles 1-5: section line ranges in meta.json fall mid-proof rather than at section boundaries.
• Existing tracker issue Gallery integrity: erdos-162 section line ranges stale (point inside theorem proofs) #21485 remains open.
• Mechanic PR fix(meta): erdos-162 realign stale section line ranges #21488 (fix: realign stale section line ranges) is still open and not yet merged.
• This PR only updates audit-tracker.json with the new audit timestamp; no content change.

Status

• Issue: open (Gallery integrity: erdos-162 section line ranges stale (point inside theorem proofs) #21485)
• Fix PR: open (fix(meta): erdos-162 realign stale section line ranges #21488) — blocked by review/merge queue, not by code

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