ci: bump a2ml-validate-action to 6bff6ec (s-expression form support)

[hyperpolymath]

Bump hyperpolymath/a2ml-validate-action from 59145c7 to 6bff6ec.

Upstream PR: hyperpolymath/a2ml-validate-action#26 (merged 2026-06-01) — validator now recognises both TOML and s-expression identity/version dialects.

Real-world bite: panic-attack#94 hit this on docs/campaigns/2026-05-26.a2ml on 2026-06-01.

Estate sweep: 215 repos in the same wave. No behavioural change unless the repo carries an s-expression-form .a2ml file.

[github-actions]

🔍 Hypatia Security Scan

Findings: 128 issues detected

Severity	Count
🔴 Critical	11
🟠 High	12
🟡 Medium	105

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Stale AI task file -- delete or move to docs/",
    "type": "stale",
    "file": "SONNET-TASKS.md",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "reason": "Action us cache\n        uses: actions/cache@8b402f58fbc84540c8b491a91e5 needs attention",
    "type": "unpinned_action",
    "file": "echidna-fuzz.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Workflow executes remote script directly (curl/wget piped to shell). Download, verify checksum/signature, then execute.",
    "type": "download_then_run",
    "file": "echidnabot.yml",
    "action": "verify_download_integrity",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "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 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"
  }
]

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