chore(dependabot): cap open pull requests per update block

[hyperpolymath]

Adds open-pull-requests-limit to Dependabot update blocks that had no cap, following the estate per-ecosystem cap doctrine (task #37). No other line in the file is touched.

Claude-Session: https://claude.ai/code/session_011eQ7hibx92N7fBDtwgReWk

Summary

Closes #

Type of change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (would change existing behaviour)
• 🕳️ Soundness fix (fixes a checker/proof false-negative)
• 📖 Documentation
• 🧹 Refactor / tech debt (behaviour-preserving)
• ⚡ Performance
• 🔧 Build / CI / tooling

How has this been verified?

Checklist

• My commits are signed (git commit -S).
• I ran the project's own checks/tests locally and they pass.
• New files carry the correct SPDX-License-Identifier (code/config MPL-2.0,
  prose CC-BY-SA-4.0); I did not relicense existing files.
• Docs are updated, and no public claim now overstates what the code does.
• I have not introduced a soundness hole (or I have flagged where I might have).

Notes for reviewers

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[github-actions]

🔍 Hypatia Security Scan

Findings: 93 issues detected

Severity	Count
🔴 Critical	9
🟠 High	25
🟡 Medium	59

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Job `triage` in label-triage.yml has no `timeout-minutes:` declaration. Default is 6 hours — a stuck codeload fetch or runner hang can burn budget. Add `timeout-minutes: 10` (or proportional).",
    "type": "missing_timeout_minutes",
    "file": "label-triage.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium",
    "recipe_id": "recipe-add-workflow-timeout-minutes",
    "job": "triage"
  },
  {
    "reason": "Job `sync` in labels.yml has no `timeout-minutes:` declaration. Default is 6 hours — a stuck codeload fetch or runner hang can burn budget. Add `timeout-minutes: 10` (or proportional).",
    "type": "missing_timeout_minutes",
    "file": "labels.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium",
    "recipe_id": "recipe-add-workflow-timeout-minutes",
    "job": "sync"
  },
  {
    "reason": "Required file missing (condition: public_repo)",
    "type": "missing_requirement",
    "file": "SECURITY.md",
    "action": "create",
    "rule_module": "cicd_rules",
    "severity": "high"
  },
  {
    "line": 44,
    "reason": "job in .github/workflows/push-email-notify.yml references `secrets.*` but does not install `step-security/harden-runner` — review outbound-egress monitoring",
    "type": "RE001",
    "file": ".github/workflows/push-email-notify.yml",
    "action": "report",
    "rule_module": "research_extensions",
    "severity": "warn"
  },
  {
    "line": 83,
    "reason": "job in .github/workflows/hypatia-scan.yml references `secrets.*` but does not install `step-security/harden-runner` — review outbound-egress monitoring",
    "type": "RE001",
    "file": ".github/workflows/hypatia-scan.yml",
    "action": "report",
    "rule_module": "research_extensions",
    "severity": "warn"
  },
  {
    "line": 45,
    "reason": "job in .github/workflows/cflite_pr.yml references `secrets.*` but does not install `step-security/harden-runner` — review outbound-egress monitoring",
    "type": "RE001",
    "file": ".github/workflows/cflite_pr.yml",
    "action": "report",
    "rule_module": "research_extensions",
    "severity": "warn"
  },
  {
    "line": 52,
    "reason": "job in .github/workflows/label-triage.yml references `secrets.*` but does not install `step-security/harden-runner` — review outbound-egress monitoring",
    "type": "RE001",
    "file": ".github/workflows/label-triage.yml",
    "action": "report",
    "rule_module": "research_extensions",
    "severity": "warn"
  },
  {
    "line": 38,
    "reason": "job in .github/workflows/labels.yml references `secrets.*` but does not install `step-security/harden-runner` — review outbound-egress monitoring",
    "type": "RE001",
    "file": ".github/workflows/labels.yml",
    "action": "report",
    "rule_module": "research_extensions",
    "severity": "warn"
  },
  {
    "line": 46,
    "reason": "job in .github/workflows/cflite_batch.yml references `secrets.*` but does not install `step-security/harden-runner` — review outbound-egress monitoring",
    "type": "RE001",
    "file": ".github/workflows/cflite_batch.yml",
    "action": "report",
    "rule_module": "research_extensions",
    "severity": "warn"
  },
  {
    "line": 20,
    "reason": "job in .github/workflows/instant-sync.yml references `secrets.*` but does not install `step-security/harden-runner` — review outbound-egress monitoring",
    "type": "RE001",
    "file": ".github/workflows/instant-sync.yml",
    "action": "report",
    "rule_module": "research_extensions",
    "severity": "warn"
  }
]

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