docs: add faithful RUST-SPARK-STANCE.adoc

[hyperpolymath]

Adds a faithful RUST-SPARK-STANCE.adoc for verisimdb.

The Idris2+Zig ABI seam (src/abi/{Types,Layout,Foreign}.idr + ffi/zig/) was present but carried no stance doc — the silent-regress risk flagged in the estate audit (status "DESIGNED-ONLY"). This doc records the seam, the SPARK/Ada admission path, and honest gaps (unfilled {{PROJECT}} placeholders in ffi/zig/src/main.zig; Idris2 not wired into CI; owed octad/drift invariants) without overclaiming.

Adversarial proof-escape census: 6 corpus files (src/abi, debugger/src/abi), all %default total, zero escapes (no believe_me/assert_total/postulate/idris_crash/sorry/admit).

Refs hyperpolymath/standards#124 (not Closes)

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 120 issues detected

Severity	Count
🔴 Critical	18
🟠 High	64
🟡 Medium	38

⚠️ 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",
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    "severity": "high"
  },
  {
    "reason": "Issue in quality.yml",
    "type": "missing_workflow",
    "file": "quality.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
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    "reason": "Issue in security-policy.yml",
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    "file": "security-policy.yml",
    "action": "create",
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    "severity": "medium"
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  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
    "type": "unpinned_action",
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    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
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  {
    "reason": "Action hyperpolymath/panic-attacker/.github/workflows/scan-and-report.yml@main needs attention",
    "type": "unpinned_action",
    "file": "security-scan.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
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  {
    "reason": "binary_to_term without :safe option -- deserialization attack (1 occurrences, CWE-502)",
    "type": "elixir_send_unsanitised",
    "file": "/home/runner/work/verisimdb/verisimdb/lib/verisim/query_cache.ex",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
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  {
    "reason": "binary_to_term without :safe option -- deserialization attack (1 occurrences, CWE-502)",
    "type": "elixir_send_unsanitised",
    "file": "/home/runner/work/verisimdb/verisimdb/lib/verisim/query_planner_config.ex",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
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  {
    "reason": "String.to_existing_atom with user input exhausts atom table -- use to_existing_atom (1 occurrences, CWE-400)",
    "type": "elixir_atom_from_user",
    "file": "/home/runner/work/verisimdb/verisimdb/elixir-orchestration/lib/verisim/query/vql_type_checker.ex",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "HTTP URL in code -- use HTTPS for non-localhost (1 occurrences, CWE-319)",
    "type": "js_http_url_in_code",
    "file": "/home/runner/work/verisimdb/verisimdb/connectors/test-infra/seed/mongodb-init.js",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "getExn on external data -- use pattern matching (1 occurrences, CWE-754)",
    "type": "getexn_on_external",
    "file": "/home/runner/work/verisimdb/verisimdb/src/registry/Registry.res",
    "action": "flag",
    "rule_module": "code_safety",
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]

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