fix(elixir-ci-reusable): wrap bare job-level if: in ${{ }} (same anti-pattern as #322/#334)

[hyperpolymath]

Summary

Same root cause as #322 / #334 — `elixir-ci-reusable.yml:105` had a bare `if:` at job level containing `hashFiles(format('{0}/mix.exs', inputs.working_directory))`. Surfaced via the sweep recipe from #334:

```bash
grep -nE '^\s+if: [^\$]+(hashFiles|format|inputs\.)' .github/workflows/*-reusable.yml
```

Only hit — every other reusable is clean. Same 2-line \${{ }} wrap.

Test plan

• Sweep recipe returns no remaining hits across reusables
• yamllint clean
• Pattern matches fix(rust-ci-reusable): wrap bare job-level if: in ${{ }} so GH parses (closes #322) #334's exact diff shape

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 201 issues detected

Severity	Count
🔴 Critical	64
🟠 High	43
🟡 Medium	94

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Action  (for the check script)\n        uses: actions/checkout@de needs attention",
    "type": "unpinned_action",
    "file": "governance-reusable.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action  (for the check script)\n        uses: actions/checkout@de needs attention",
    "type": "unpinned_action",
    "file": "governance-reusable.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in affinescript-verify.yml",
    "type": "missing_timeout_minutes",
    "file": "affinescript-verify.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "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 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 changelog-reusable.yml",
    "type": "missing_timeout_minutes",
    "file": "changelog-reusable.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in codeql-reusable.yml",
    "type": "missing_timeout_minutes",
    "file": "codeql-reusable.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in codeql.yml",
    "type": "missing_timeout_minutes",
    "file": "codeql.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in deno-ci-reusable.yml",
    "type": "missing_timeout_minutes",
    "file": "deno-ci-reusable.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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