Remove duplicate root-level permissions block in verify workflow

[Copilot]

The verify workflow contained two root-level permissions: blocks (lines 3-4 and 10-11). YAML allows duplicate keys but the last one wins, creating confusion and masking future edits.

Changes:

• Removed duplicate permissions: contents: read block
• Retained single root-level permissions declaration
• Preserved job-level permissions: {} override on gate job

name: Verify

permissions:
  contents: read

on:
  push:
  pull_request:

concurrency:
  group: verify-${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

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