Fix #431: Add verifier for Frantic bounty #134 (Ausca Browser Session)

[s6pa1rta3n-lab]

Scope

Related issue or bounty:
Fixes #431 - Frantic bounty #134: Run an Ausca Browser Session 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/134-check-ausca-browser-session.sh to provide an automated machine-floor verifier for bounty #134 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, browser/CDP/lease 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/134-check-ausca-browser-session.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.

Payout Routing

• EVM (Base/Arbitrum/Polygon/ETH): 0xF46C9F6d70C50BF81ef3588AB523a90a594a2F89
• Stellar: GCL6OXAMLD75BMTINA6EMRUDWK5THQUSHMYNLSNBCJAPZJHNYJTUNIBC