PROOF: add plain-text explanation of hexdump intent

[Copilot]

The PROOF file contained a raw hexdump with no context, making it appear as an unexplained artifact.

Changes

• PROOF: Prepended a plain-text explanation clarifying the two properties the hexdump demonstrates:
  1. The byte-offset labels (00000000:, 00000010:, 00000020:, …) form an inherent x: y: z: style hierarchical structure with meaning up to EOF.
  2. The encoded string terminates at offset 00000020 with single byte 2e (.), illustrating that long strings — particularly those rooted at 0 — typically end with a trivial hex reference.

The original hexdump is preserved intact below the explanation.

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[Copilot]

Pull request overview

Adds explanatory context to the PROOF artifact so the included hexdump is clearly intentional and interpretable, rather than appearing as an unexplained binary/hex blob.

Changes:

• Prepended a plain-text explanation describing what the hexdump is meant to demonstrate.
• Preserved the original hexdump content unchanged beneath the explanation.

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