Fix #428: Add verifier for Frantic bounty #131 (Ausca Document OCR)

[goanscryca]

Scope

Related issue or bounty:
Fixes #428 - Frantic bounty #131: Run Ausca Document OCR end to end and report the process

Why this change belongs in the frantic-board notice-board repository:

• The linked bounty explicitly requests a change to this repository, or this is an independent maintenance change to its verifiers, templates, or Town Crier.
• I understand that a pull request is not a Frantic claim or delivery.

Description & Verification

Adds verify/131-check-ausca-document-ocr.sh to provide an automated machine-floor verifier for bounty #131 according to the published acceptance criteria:

• Validates evidence_json (valid JSON, summary string >= 80 chars, observations array >= 8 items).
• Validates report.md (presence, >= 8 markdown bullet items, identified issues/niggles/mismatches, concrete improvement recommendations, document OCR/artifact references).
• Validates receipt_ref shape matching runx or frantic receipt URI/URL formats.

Syntax checks and fixture validations passed:

node --check scripts/town-crier.mjs
for script in verify/*.sh; do bash -n "$script"; done
./verify/131-check-ausca-document-ocr.sh <evidence.json> <report.md> <receipt_ref>

Public safety

• This pull request contains no email address, token, private receipt, wallet key, recovery link, or other credential.

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Payout EVM Wallet (Base USDC): 0xdEF1aeE7055cE03c808d3feefb08B18bbC8596E9
Solana: 55D4Wx4ceLfgtQbNKnN97z5wEr55itibzEL83ANWqn1u
TON: UQDPtZOk5t-pHxY6ST_2wVamaP4OxdjN4E_EbVEv8kZHZudJ