refactor(root): relocate the contributing guide into .github/

[hyperpolymath]

refactor(root): relocate the contributing guide into .github/

The estate canonical location is .github/CONTRIBUTING.md, which GitHub
auto-discovers; the root copy is removed and references are updated in the same
change.

• .github/CONTRIBUTING.md
  (new)
• CONTRIBUTING.adoc
  (deleted)

[coderabbitai]

Note

Currently processing new changes in this PR. This may take a few minutes, please wait...

⚙️ Run configuration

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Review profile: ASSERTIVE

Plan: Advanced

Run ID: 6cf7e209-9ff1-4781-9f14-7484d473ccdf

📥 Commits

Reviewing files that changed from the base of the PR and between ade6aaf and 77ab858.

📒 Files selected for processing (2)

• .github/CONTRIBUTING.md
• CONTRIBUTING.adoc

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[github-actions]

🔍 Hypatia Security Scan

Findings: 38 issues detected

Severity	Count
🔴 Critical	1
🟠 High	15
🟡 Medium	22

⚠️ 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": 56,
    "reason": "job in .github/workflows/dependabot-automerge.yml references `secrets.*` but does not install `step-security/harden-runner` — review outbound-egress monitoring",
    "type": "RE001",
    "file": ".github/workflows/dependabot-automerge.yml",
    "action": "report",
    "rule_module": "research_extensions",
    "severity": "warn"
  },
  {
    "line": 74,
    "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": 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": 48,
    "reason": "workflow .github/workflows/dependabot-automerge.yml:48 gates on `github.actor == 'dependabot[bot]'` — `github.actor` is the run-triggering user, which an attacker controls on `pull_request_target` from a fork",
    "type": "RE008",
    "file": ".github/workflows/dependabot-automerge.yml",
    "action": "report",
    "rule_module": "research_extensions",
    "severity": "critical"
  },
  {
    "line": null,
    "reason": "workflow .github/workflows/dependabot-automerge.yml has top-level `permissions:` with `contents: write` AND performs a write (push/commit/release/PR). It is over-broad, but narrowing the workflow level alone WOULD BREAK IT — no job declares its own `permissions:`.",
    "type": "WH002",
    "file": ".github/workflows/dependabot-automerge.yml",
    "action": "report",
    "rule_module": "workflow_hardening",
    "severity": "warn"
  },
  {
    "line": 12,
    "reason": "workflow .github/workflows/mirror.yml:12 uses `secrets: inherit` — forwards every caller secret to the reusable workflow",
    "type": "WH008",
    "file": ".github/workflows/mirror.yml",
    "action": "report",
    "rule_module": "workflow_hardening",
    "severity": "warn"
  }
]

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