docs: seed docs/proof-debt.md index per trusted-base policy

[hyperpolymath]

Summary

• Adds a thin, schema-conformant index at docs/proof-debt.md.
• References PROOF-NEEDS.md as the source of truth — no content duplication.
• P1 seed in the trusted-base reduction policy chain.

What this PR does NOT do

Migrate the substantive content out of PROOF-NEEDS.md. That file remains canonical; this file just makes the schema-conformant filename exist for the check-trusted-base.sh CI gate.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 55 issues detected

Severity	Count
🔴 Critical	9
🟠 High	18
🟡 Medium	28

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Merge artifact in root",
    "type": "stale",
    "file": "SPEC.core.scm.orig",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "medium"
  },
  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "No permissions declaration -- add permissions: read-all",
    "type": "missing_permissions",
    "file": "comprehensive-quality.yml",
    "action": "add_permissions",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/betlang/betlang/playground/src/main.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/betlang/betlang/playground/src/probability.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/betlang/betlang/playground/src/ternary.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/betlang/betlang/playground/test/probability_test.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/betlang/betlang/playground/test/ternary_test.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/betlang/betlang/playground/examples/uncertainty.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "Atom creation from untrusted input may exhaust atom table (1 occurrences, CWE-400)",
    "type": "erlang_atom_from_untrusted",
    "file": "/home/runner/work/betlang/betlang/lsp/bet-lsp/build/packages/thoas/src/thoas_decode.erl",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  }
]

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[hyperpolymath]

Superseded by #39, which corrects the marker count (3 → 1) and substantively classifies substTop_preserves_typing as §(c) NECESSARY AXIOM per the standards#203 schema.