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: 3 issues detected

Severity	Count
🔴 Critical	0
🟠 High	1
🟡 Medium	2

View findings

[
  {
    "reason": "Repository has 4 non-main remote branch(es). Policy: single main branch only.",
    "type": "GS007",
    "file": ".",
    "action": "delete_remote_branches",
    "rule_module": "git_state",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Scorecard): SASTID -- SAST -- 6 day(s) old",
    "type": "CSA001",
    "file": "no file associated with this alert",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Scorecard): TokenPermissionsID -- Token-Permissions -- 6 day(s) old",
    "type": "CSA001",
    "file": ".github/workflows/hypatia-scan.yml",
    "action": "update",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  }
]

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