chore(nix->guix): remove flake.nix (Guix-only)

[hyperpolymath]

Removes flake.nix/flake.lock per the estate Nix ban (Guix sole pkg mgr). Fresh from origin. 2026-06-24.

[github-actions]

🔍 Hypatia Security Scan

Findings: 125 issues detected

Severity	Count
🔴 Critical	4
🟠 High	34
🟡 Medium	87

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Workflow executes remote script directly (curl/wget piped to shell). Download, verify checksum/signature, then execute.",
    "type": "download_then_run",
    "file": "lean-verification.yml",
    "action": "verify_download_integrity",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Workflow executes remote script directly (curl/wget piped to shell). Download, verify checksum/signature, then execute.",
    "type": "download_then_run",
    "file": "rust-cli.yml",
    "action": "verify_download_integrity",
    "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 bridge-forbidden-phrases.yml",
    "type": "missing_timeout_minutes",
    "file": "bridge-forbidden-phrases.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",
    "type": "missing_timeout_minutes",
    "file": "casket-pages.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cflite_batch.yml",
    "type": "missing_timeout_minutes",
    "file": "cflite_batch.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cflite_pr.yml",
    "type": "missing_timeout_minutes",
    "file": "cflite_pr.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in compilation_tests.yml",
    "type": "missing_timeout_minutes",
    "file": "compilation_tests.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in compilation_tests.yml",
    "type": "missing_timeout_minutes",
    "file": "compilation_tests.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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