docs: checkpoint — fix stale .scm state pointers; drop orphan submodule entry

[hyperpolymath]

Part of the cross-repo documentation checkpoint (2026-06-05). 6a2/STATE.a2ml here is already current (2026-06-02), so this is correctness-only.

Changes

• ROADMAP.adoc + CHANGELOG.md: repointed stale .machine_readable/STATE.scm → .machine_readable/6a2/STATE.a2ml (the state files were migrated to a2ml under 6a2/).
• .gitmodules: removed the orphan language-playgrounds submodule stanza (declared but no directory, never initialized). The other 12 submodule entries are untouched.

Deferred to follow-up issues (not in this PR)

• ReScript→AffineScript residue across several docs (post the docs(claude-md): flip ReScript→AffineScript per 2026-05-25 estate language policy #61 policy flip).
• svc/k9/ documented in svc/README.adoc but the directory is absent.
• docs/quickstart.adoc drift (.scm workflow, dead ~/Documents/... links).
• KitchenSpeak Phase-1a: machine-check Dough.agda / register echo-types+absolute-zero in CI (proof honesty is otherwise exemplary).
• Contractile sextet completion — parked pending the rsr-template spec.

🤖 Draft — opened after an automated, reviewed checkpoint edit.

https://claude.ai/code/session_01BwV2DWsjkBiNP3oscimMLV

---

Generated by Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 31 issues detected

Severity	Count
🔴 Critical	5
🟠 High	10
🟡 Medium	16

⚠️ Action Required: Critical security issues found!

View findings

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Powered by Hypatia Neurosymbolic CI/CD Intelligence

[github-actions]

🔍 Hypatia Security Scan

Findings: 31 issues detected

Severity	Count
🔴 Critical	5
🟠 High	10
🟡 Medium	16

⚠️ Action Required: Critical security issues found!

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",
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    "file": "hypatia-scan.yml",
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    "severity": "medium"
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  {
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    "action": "flag",
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    "reason": "Agda postulate assumes without proof -- potential soundness hole (1 occurrences, CWE-704)",
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    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  }
]

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