docs(policies): trusted-base reduction policy for proof debt

[hyperpolymath]

Summary

• Adds docs/TRUSTED-BASE-REDUCTION-POLICY.adoc — formalises the boj-server backend-assurance harness pattern as estate-wide policy.
• Defines three permissible dispositions for every soundness-relevant escape hatch (Axiom, Admitted, sorry, postulate, believe_me, assume val, unsafePerformIO, …):
  • (a) DISCHARGED — proof exists.
  • (b) BUDGETED — covered by property tests at a documented refutation budget.
  • (c) NECESSARY AXIOM — metatheoretic assumption with citation.
  • (d) DEBT — everything else, lives in docs/proof-debt.md with deadline + owner.
• Includes docs/proof-debt.md schema, per-language annotation conventions (TRUSTED:/AXIOM: leading comments), and an enforcement plan (future scripts/check-trusted-base.sh wired into governance-reusable.yml).
• Closes Item 5 of the 2026-05-26 estate tech-debt audit follow-up.

Initial migration order

• P0: ephapax (3 Admitteds with discharge plan in memory), boj-server (reference impl).
• P1: absolute-zero (387 markers), maa-framework (134 in 25 files), betlang (1 named axiom), proven (372 TODO PROOF).
• P2: standards itself, typed-wasm, stapeln, vcl-ut, hypatia, snifs, somethings-fishy.

Companion PRs

• standards#195 — proof debt audit (the empirical motivation)
• standards#201 — licence-consistency CI check (the precedent for check-trusted-base.sh)

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 118 issues detected

Severity	Count
🔴 Critical	64
🟠 High	43
🟡 Medium	11

⚠️ Action Required: Critical security issues found!

View findings

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  {
    "reason": "Python file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/standards/standards/a2ml-templates/state-scm-to-v2.py",
    "action": "flag",
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  {
    "reason": "TypeScript file detected -- banned language",
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    "file": "/home/runner/work/standards/standards/a2ml/bindings/deno/mod.ts",
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  {
    "reason": "TypeScript file detected -- banned language",
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    "file": "/home/runner/work/standards/standards/lol/test/vitest.config.ts",
    "action": "flag",
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  {
    "reason": "TypeScript file detected -- banned language",
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    "file": "/home/runner/work/standards/standards/k9-svc/bindings/deno/mod.ts",
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    "reason": "Agda postulate assumes without proof -- potential soundness hole (4 occurrences, CWE-704)",
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    "severity": "critical"
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  {
    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
    "type": "believe_me",
    "file": "/home/runner/work/standards/standards/lol/src/abi/Locale.idr",
    "action": "flag",
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    "severity": "critical"
  },
  {
    "reason": "Wildcard CORS -- restrict to specific origins or use env var (1 occurrences, CWE-942)",
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]

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