chore(ci): add dormant push-email notification workflow

[hyperpolymath]

Backfills the dormant push-email workflow (gated by vars.PUSH_EMAIL_ENABLED; sending needs org SMTP secrets). Inherited by new repos from the template — this places it on this existing repo. No effect until armed.

[github-actions]

🔍 Hypatia Security Scan

Findings: 6 issues detected

Severity	Count
🔴 Critical	0
🟠 High	3
🟡 Medium	3

View findings

[
  {
    "reason": "No test directory or test files found",
    "type": "no_tests",
    "file": "/home/runner/work/echo-types/echo-types",
    "action": "flag",
    "rule_module": "honest_completion",
    "severity": "high",
    "deduction": 20
  },
  {
    "reason": "Issue in push-email-notify.yml",
    "type": "missing_timeout_minutes",
    "file": "push-email-notify.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Repository has 7 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): TokenPermissionsID -- Token-Permissions -- 22 day(s) old [STALE]",
    "type": "CSA001",
    "file": ".github/workflows/scorecard.yml",
    "action": "escalate",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code-scanning alert TokenPermissionsID (high) at .github/workflows/scorecard.yml is 22 days old (threshold: 7 days) -- overdue for remediation",
    "type": "CSA003",
    "file": ".github/workflows/scorecard.yml",
    "action": "escalate",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code-scanning alert hypatia/code_safety/agda_postulate dismissed as 'false positive' -- ensure dismissal is documented and justified",
    "type": "CSA004",
    "file": "proofs/agda/EchoImageFactorizationPropPostulated.agda",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  }
]

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