harden(ci): concurrency-cancel guard on canonical check workflows

[hyperpolymath]

Redistributes merged standards#122. Adds concurrency{cancel-in-progress:true} to read-only check workflows (scorecard.yml scorecard-enforcer.yml governance.yml secret-scanner.yml) and scopes affinescript-verify push where present. Zero check coverage lost; read-only workflows only. 🤖 estate sweep

[github-actions]

🔍 Hypatia Security Scan

Findings: 20 issues detected

Severity	Count
🔴 Critical	1
🟠 High	8
🟡 Medium	11

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Required file missing",
    "type": "missing",
    "file": "SECURITY.md",
    "action": "create",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "reason": "Issue in quality.yml",
    "type": "missing_workflow",
    "file": "quality.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in security-policy.yml",
    "type": "missing_workflow",
    "file": "security-policy.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Action actions/checkout@v4 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action Swatinem/rust-cache@v2 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action actions/checkout@v4 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action dtolnay/rust-toolchain@master needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Action Swatinem/rust-cache@v2 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Required file missing (condition: public_repo)",
    "type": "missing_requirement",
    "file": "SECURITY.md",
    "action": "create",
    "rule_module": "cicd_rules",
    "severity": "high"
  }
]

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