docs(EXPLAINME): convert 16 Markdown code fences to AsciiDoc source blocks

[hyperpolymath]

Summary

• Converts all 16 Markdown code blocks in EXPLAINME.adoc to AsciiDoc [source,lang] / ---- form (languages: rust, csv, bash, and several unannotated literal blocks for directory trees / hash pseudocode).
• All blocks live inside numbered list items, so each gets a leading + continuation marker to keep the block attached to its parent item.
• Total: 32 triple-backtick markers replaced (16 opening, 16 closing).

This is the largest single file in the cross-estate "EXPLAINME.adoc quote fixes" sweep (5 affected repos, 30+ markers total).

Test plan

• No remaining ``` markers in EXPLAINME.adoc (grep -nF confirmed empty)
• Visual render check after merge

[github-actions]

🔍 Hypatia Security Scan

Findings: 71 issues detected

Severity	Count
🔴 Critical	0
🟠 High	5
🟡 Medium	66

View findings

[
  {
    "reason": "Action perpolymath/standards/.github/workflows/governance-reusable.yml@main\n needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in boj-build.yml",
    "type": "missing_timeout_minutes",
    "file": "boj-build.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cargo-audit.yml",
    "type": "missing_timeout_minutes",
    "file": "cargo-audit.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cargo-audit.yml",
    "type": "missing_timeout_minutes",
    "file": "cargo-audit.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in casket-pages.yml",
    "type": "missing_timeout_minutes",
    "file": "casket-pages.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in casket-pages.yml",
    "type": "missing_timeout_minutes",
    "file": "casket-pages.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cflite_batch.yml",
    "type": "missing_timeout_minutes",
    "file": "cflite_batch.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cflite_pr.yml",
    "type": "missing_timeout_minutes",
    "file": "cflite_pr.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in codeql.yml",
    "type": "missing_timeout_minutes",
    "file": "codeql.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dependabot-automerge.yml",
    "type": "missing_timeout_minutes",
    "file": "dependabot-automerge.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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