chore(nix->guix): delete Nix estate-wide (#138)

[hyperpolymath]

Automated sweep to eradicate Nix from the estate as Guix is now the sole reproducible environment.

[gitar-bot]

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[github-actions]

🔍 Hypatia Security Scan

Findings: 54 issues detected

Severity	Count
🔴 Critical	10
🟠 High	31
🟡 Medium	13

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Agda postulate assumes without proof -- potential soundness hole (1 occurrences, CWE-704)",
    "type": "agda_postulate",
    "file": "/home/runner/work/valence-shell/valence-shell/proofs/agda/FilesystemModel.agda",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "believe_me undermines formal verification (2 occurrences, CWE-704)",
    "type": "believe_me",
    "file": "/home/runner/work/valence-shell/valence-shell/proofs/idris2/src/Filesystem/Axioms.idr",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "JSON decode without validation (1 occurrences, CWE-20)",
    "type": "json_decode_no_validation",
    "file": "/home/runner/work/valence-shell/valence-shell/impl/mcp/src/Server.res",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "Obj.magic bypassing type safety (2 occurrences, CWE-704)",
    "type": "obj_magic",
    "file": "/home/runner/work/valence-shell/valence-shell/impl/mcp/src/bindings/Mcp.res",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "unsafe block -- requires SAFETY comment (16 occurrences, CWE-676)",
    "type": "unsafe_block",
    "file": "/home/runner/work/valence-shell/valence-shell/impl/rust-cli/src/commands.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "as_ptr exposes raw pointer that may dangle or alias unsafely (6 occurrences, CWE-676)",
    "type": "as_ptr",
    "file": "/home/runner/work/valence-shell/valence-shell/impl/rust-cli/src/commands.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "expect() in hot path (4 occurrences, CWE-754)",
    "type": "expect_in_hot_path",
    "file": "/home/runner/work/valence-shell/valence-shell/impl/rust-cli/src/parser.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "unsafe block -- requires SAFETY comment (2 occurrences, CWE-676)",
    "type": "unsafe_block",
    "file": "/home/runner/work/valence-shell/valence-shell/impl/rust-cli/src/process_sub.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "as_ptr exposes raw pointer that may dangle or alias unsafely (2 occurrences, CWE-676)",
    "type": "as_ptr",
    "file": "/home/runner/work/valence-shell/valence-shell/impl/rust-cli/src/process_sub.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "unwrap() without prior check -- DoS via panic (1 occurrences, CWE-754)",
    "type": "unwrap_without_check",
    "file": "/home/runner/work/valence-shell/valence-shell/impl/rust-cli/src/test_command.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  }
]

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