fix(ci): remove placeholder entry blocking Dependabot

[hyperpolymath]

This dependabot.yml carries GitHub's unedited placeholder alongside a real, correct entry:

  - package-ecosystem: ""   # See documentation for possible values

An empty package-ecosystem fails Dependabot's schema validation, and GitHub rejects the whole file — not just the bad entry. So the real github-actions entry has never run either.

Measured, not assumed

The three estate repos in exactly this state have 0 Dependabot PRs between them, while comparable repos with valid configs have plenty:

repo	config	Dependabot PRs
blocky-writer	stub + real entry	0
jtv-lang	stub + real entry	0
lcb-website	stub + real entry	0
aerie	valid	7
standards	valid	8
affinescript	valid	16
hypatia	valid	63

All three do have a populated .github/workflows/, so there is genuinely something for github-actions to update.

Fix

Excise the stub block. The real entry is untouched and becomes live. Where an entry lacked a groups: block it gains one, so an ecosystem-wide bump arrives as one PR instead of one per dependency.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 58 issues detected

Severity	Count
🔴 Critical	0
🟠 High	22
🟡 Medium	36

View findings

[
  {
    "reason": "Issue in scorecard.yml",
    "type": "missing_workflow",
    "file": "scorecard.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Action actions/checkout@v4 needs attention",
    "type": "unpinned_action",
    "file": "pages.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action actions/checkout@v4 needs attention",
    "type": "unpinned_action",
    "file": "pages.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action actions/upload-pages-artifact@v3 needs attention",
    "type": "unpinned_action",
    "file": "pages.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action actions/deploy-pages@v4 needs attention",
    "type": "unpinned_action",
    "file": "pages.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in ci.yml",
    "type": "npermissions_typo",
    "file": "ci.yml",
    "action": "fix_typo",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "codeql.yml lists `language: javascript-typescript` but the repo has no source files in any CodeQL-scannable language. The analyze job will exit 'no source files' on every run. Switch the matrix to `actions` (which scans workflow files — every repo has those).",
    "type": "codeql_language_matrix_mismatch",
    "file": "codeql.yml",
    "action": "switch_codeql_matrix_to_actions",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "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"
  }
]

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