security: remediate Track C and Track E findings

[hyperpolymath]

Resolved multiple CVEs (quinn, webpki) by updating nickel-lang-core to v0.18. Mitigated memory exhaustion by bounding file reads.

[github-actions]

🔍 Hypatia Security Scan

Findings: 39 issues detected

Severity	Count
🔴 Critical	1
🟠 High	16
🟡 Medium	22

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "No test directory or test files found",
    "type": "no_tests",
    "file": "/home/runner/work/formatrix-docs/formatrix-docs",
    "action": "flag",
    "rule_module": "honest_completion",
    "severity": "high",
    "deduction": 20
  },
  {
    "reason": "codeql.yml lists `language: javascript-typescript` but the repo has no source files in any CodeQL-scannable language. The analyze job will exit 'no source files' on every run. Switch the matrix to `actions` (which scans workflow files — every repo has those).",
    "type": "codeql_language_matrix_mismatch",
    "file": "codeql.yml",
    "action": "switch_codeql_matrix_to_actions",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in scorecard-enforcer.yml",
    "type": "scorecard_publish_with_run_step",
    "file": "scorecard-enforcer.yml",
    "action": "split_scorecard_publish_job",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in instant-sync.yml",
    "type": "secret_action_without_presence_gate",
    "file": "instant-sync.yml",
    "action": "peter-evans/repository-dispatch",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  }
]

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