chore: retire local templates -> inherit org .github canon

[hyperpolymath]

Removes redundant local templates so this repo inherits the org-wide canon from hyperpolymath/.github. Direct push to main was blocked (branch protection), hence this PR.

[github-actions]

🔍 Hypatia Security Scan

Findings: 21 issues detected

Severity	Count
🔴 Critical	0
🟠 High	18
🟡 Medium	3

View findings

[
  {
    "reason": "Action julia-actions/CompatHelper@v1 needs attention",
    "type": "unpinned_action",
    "file": "CompatHelper.yml",
    "action": "pin_sha",
    "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": "Issue in instant-sync.yml",
    "type": "secret_action_without_presence_gate",
    "file": "instant-sync.yml",
    "action": "peter-evans/repository-dispatch",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "1 workflow(s) with tag-pinned (not SHA-pinned) actions in Cliodynamics.jl",
    "type": "DependencyPinning",
    "file": "/home/runner/work/Cliodynamics.jl/Cliodynamics.jl",
    "action": "auto_fix",
    "rule_module": "scorecard",
    "severity": "medium",
    "remediation": "Pin GitHub Actions and Docker base images by SHA hash.",
    "scorecard_check": "Pinned-Dependencies"
  },
  {
    "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): TokenPermissionsID -- Token-Permissions -- 5 day(s) old",
    "type": "CSA001",
    "file": ".github/workflows/Documenter.yml",
    "action": "update",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code scanning (Scorecard): TokenPermissionsID -- Token-Permissions -- 8 day(s) old [STALE]",
    "type": "CSA001",
    "file": ".github/workflows/hypatia-scan.yml",
    "action": "escalate",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code scanning (Scorecard): TokenPermissionsID -- Token-Permissions -- 8 day(s) old [STALE]",
    "type": "CSA001",
    "file": ".github/workflows/dependabot-automerge.yml",
    "action": "escalate",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code scanning (Scorecard): TokenPermissionsID -- Token-Permissions -- 8 day(s) old [STALE]",
    "type": "CSA001",
    "file": ".github/workflows/TagBot.yml",
    "action": "escalate",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code scanning (Scorecard): TokenPermissionsID -- Token-Permissions -- 8 day(s) old [STALE]",
    "type": "CSA001",
    "file": ".github/workflows/Documenter.yml",
    "action": "escalate",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  }
]

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