chore(submodule): convert absolute-zero/ to git submodule pinned to upstream (closes #84)

[hyperpolymath]

Summary

• Replace the in-tree absolute-zero/ vendored copy (232 files / ~36k LOC) with a git submodule pinned at upstream hyperpolymath/absolute-zero@7da92b3.
• Rename proof-debt §(e) VENDORED → SUBMODULE; refresh wording; close out the "Open owner question 1: vendoring policy".
• Refresh .hypatia-ignore header comment to reflect submodule status (entries stay as a defensive measure).

Why

Per the issue body, two siblings of hyperpolymath/absolute-zero exist in this repo's history: one in-tree, one canonical upstream. The issue's own second status-update comment (2026-05-27 15:01Z) confirmed PR #83's re-vendor + absolute-zero#65 upstreaming left the trees as 174 byte-identical paths + 0 maa-only files + 7 files lightly upstream-newer. Disposition (B) submodule conversion is the cleanest landing.

Behaviour impact

• check-trusted-base.sh uses find . which walks submodule contents naturally (verified in hyperpolymath/standards/scripts/check-trusted-base.sh:54 — PRUNE_PATHS does not list submodules). The 149/150 marker count is preserved.
• No build/CI references to absolute-zero/ paths exist outside the submodule itself (verified via grep -rln "absolute-zero/" --include="*.yml" --include="Justfile" . — only hits are inside the submodule directory).
• Existing prose references to absolute-zero/src/..., .../tests/..., etc. (in EXPLAINME.adoc, TEST-NEEDS.md, aletheia/conformance/ECHIDNA-CONFORMANCE.md) continue to resolve through the checked-out submodule directory.

Test plan

• CI green (submodule fetched on workflow runs)
• git submodule update --init absolute-zero succeeds on a fresh clone
• bash scripts/check-trusted-base.sh . (from hyperpolymath/standards) still reports the same marker count after submodule conversion
• Bump path: git submodule update --remote absolute-zero advances pin cleanly

Closes #84.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 57 issues detected

Severity	Count
🔴 Critical	0
🟠 High	14
🟡 Medium	43

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": "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 boj-build.yml",
    "type": "missing_timeout_minutes",
    "file": "boj-build.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",
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    "file": "casket-pages.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 dogfood-gate.yml",
    "type": "missing_timeout_minutes",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "missing_timeout_minutes",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "missing_timeout_minutes",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "missing_timeout_minutes",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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