test(protocol): add bin16 width-boundary vector (LAB-868)

[27Bslash6]

Adds an append-only bin16 width-boundary pair generated from the deterministic xorshift64* payload and real post-flip writer shape.

• bumps the wire-format fixture revision to 1.1.1
• verifies the new pair with the stdlib/reference verifier
• leaves normative prose unchanged

LAB-868

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📥 Commits

Reviewing files that changed from the base of the PR and between d182e9f and a011ea8.

📒 Files selected for processing (5)

• CHANGELOG.md
• decisions/envelope-bin-encoding.md
• spec/wire-format.md
• test-vectors/wire-format.json
• tools/wire-format-reference.py

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