ci(hardening): curl|sh installers → download-then-run

[hyperpolymath]

Part of the workflow-hardening pass. Removes the curl | sh pipe-to-shell pattern from the installer sites, clearing the Hypatia download_then_run / shell_download_then_run findings.

Done

• proof-regression.yml — the elan (Lean toolchain) installer now downloads to a file, then executes, instead of curl … | sh.
• setup.sh — the just installer (both sites) + the usage one-liner comment switched to download-then-run (download, inspect, then run — on-brand for a security language).
• All explanatory comments reworded so they don't themselves contain the literal the scanner matches (the lesson from the rsr_check false-positive earlier in this branch's history).

Deferred — can't do safely from this session

Both need the hyperpolymath/standards reusable contract, which is out of this session's MCP scope (the repo is private — WebFetch 403 — and list_repos/add_repo aren't surfaced here). I only have a partial SHA (524523c) from STATE, and guessing the filename/full-SHA would break the workflow:

• secret-scanner.yml (missing_workflow) — needs hyperpolymath/standards/.github/workflows/secret-scanner-reusable.yml@<full-SHA>.
• scorecard.yml job-permissions — needs the scorecard reusable's permission contract (too-narrow perms break supply-chain scanning).

To finish those I'd need the reusable refs, standards added to scope, or for you to apply them.

https://claude.ai/code/session_01BJmfoz1ZS1Pejy9LLMY742

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Generated by Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 51 issues detected

Severity	Count
🔴 Critical	0
🟠 High	25
🟡 Medium	26

View findings

[
  {
    "reason": "No test directory or test files found",
    "type": "no_tests",
    "file": "/home/runner/work/julia-the-viper/julia-the-viper",
    "action": "flag",
    "rule_module": "honest_completion",
    "severity": "high",
    "deduction": 20
  },
  {
    "reason": "Issue in secret-scanner.yml",
    "type": "missing_workflow",
    "file": "secret-scanner.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in scorecard.yml",
    "type": "scorecard_wrapper_missing_job_permissions",
    "file": "scorecard.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "unwrap() without prior check -- DoS via panic (10 occurrences, CWE-754)",
    "type": "unwrap_without_check",
    "file": "/home/runner/work/julia-the-viper/julia-the-viper/crates/jtv-core/benches/interpreter_bench.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "unwrap() without prior check -- DoS via panic (6 occurrences, CWE-754)",
    "type": "unwrap_without_check",
    "file": "/home/runner/work/julia-the-viper/julia-the-viper/crates/jtv-core/benches/parser_bench.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "Js.Array2 deprecated -- use Array (3 occurrences)",
    "type": "deprecated_api",
    "file": "/home/runner/work/julia-the-viper/julia-the-viper/vscode-extension/src/Extension.res",
    "action": "search_replace",
    "rule_module": "migration_rules",
    "severity": "high"
  },
  {
    "reason": "Js.Promise deprecated -- use Promise (2 occurrences)",
    "type": "deprecated_api",
    "file": "/home/runner/work/julia-the-viper/julia-the-viper/vscode-extension/src/Extension.res",
    "action": "module_replace",
    "rule_module": "migration_rules",
    "severity": "medium"
  },
  {
    "reason": "Belt.Array deprecated -- use Array (30 occurrences)",
    "type": "deprecated_api",
    "file": "/home/runner/work/julia-the-viper/julia-the-viper/packages/jtv-analyzer/src/Main.res",
    "action": "module_replace",
    "rule_module": "migration_rules",
    "severity": "high"
  },
  {
    "reason": "Belt.Option deprecated -- use Option (2 occurrences)",
    "type": "deprecated_api",
    "file": "/home/runner/work/julia-the-viper/julia-the-viper/packages/jtv-analyzer/src/Main.res",
    "action": "module_replace",
    "rule_module": "migration_rules",
    "severity": "medium"
  },
  {
    "reason": "Js.Array2 deprecated -- use Array (7 occurrences)",
    "type": "deprecated_api",
    "file": "/home/runner/work/julia-the-viper/julia-the-viper/packages/jtv-analyzer/src/Main.res",
    "action": "search_replace",
    "rule_module": "migration_rules",
    "severity": "high"
  }
]

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