fix(phronesis-ast): move stranded #![forbid(unsafe_code)] to crate top (crate now compiles)

[hyperpolymath]

Problem

compiler/phronesis-ast/src/lib.rs did not compile. #![forbid(unsafe_code)] — a crate-level inner attribute — was stranded at line 34, in the middle of the file between the Span doc comment and struct Span:

error: an inner attribute is not permitted in this context
  --> src/lib.rs:34
   = note: inner attributes ... are usually found at the beginning of source files
   = the inner attribute doesn't annotate this struct

This is the residue of a botched merge resolution (the attribute belongs at the top of the file). Because the crate failed to build, its unit tests never ran.

Fix

Moved #![forbid(unsafe_code)] to the top of the file — after the SPDX header, before the module docs (its valid crate-level position). One line moved; no other changes; SPDX header untouched.

Verification

$ cargo build   # Finished `dev` profile … (exit 0)
$ cargo test    # test result: ok. 21 passed; 0 failed

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 30 issues detected

Severity	Count
🔴 Critical	0
🟠 High	7
🟡 Medium	23

View findings

[
  {
    "reason": "Action trufflesecurity/trufflehog@main needs attention",
    "type": "unpinned_action",
    "file": "secret-scanner.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in secret-scanner.yml",
    "type": "missing_timeout_minutes",
    "file": "secret-scanner.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in scorecard-enforcer.yml",
    "type": "scorecard_publish_with_run_step",
    "file": "scorecard-enforcer.yml",
    "action": "split_scorecard_publish_job",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "binary_to_term without :safe option -- deserialization attack (1 occurrences, CWE-502)",
    "type": "elixir_send_unsanitised",
    "file": "/home/runner/work/phronesis/phronesis/lib/phronesis/compiler.ex",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "Nominal-only SAST in phronesis: codeql.yml language matrix contains no language present in the repo and lacks `actions`, so CodeQL records zero results on every commit. Remediation: set the CodeQL matrix to `language: actions`.",
    "type": "StaticAnalysis",
    "file": "/home/runner/work/phronesis/phronesis",
    "action": "auto_fix",
    "rule_module": "scorecard",
    "severity": "medium",
    "remediation": "Add CodeQL or equivalent SAST workflow.",
    "scorecard_check": "SAST"
  },
  {
    "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 (Hypatia): hypatia/structural_drift/SD007 -- Hypatia structural_drift: SD007 -- 3 day(s) old",
    "type": "CSA001",
    "file": ".claude/CLAUDE.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD007 -- Hypatia structural_drift: SD007 -- 3 day(s) old",
    "type": "CSA001",
    "file": ".claude/CLAUDE.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD007 -- Hypatia structural_drift: SD007 -- 3 day(s) old",
    "type": "CSA001",
    "file": ".claude/CLAUDE.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD007 -- Hypatia structural_drift: SD007 -- 3 day(s) old",
    "type": "CSA001",
    "file": ".claude/CLAUDE.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  }
]

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