chore(linguist): exclude ReScript from language detection

[hyperpolymath]

Estate-wide policy: ReScript is being migrated to AffineScript. Pending mechanical migration; this PR is the immediate cosmetic fix to stop ReScript dominating GitHub's primary-language detection until the source files are ported.

Part of estate-wide metadata cleanup 2026-05-26.

[github-actions]

🔍 Hypatia Security Scan

Findings: 75 issues detected

Severity	Count
🔴 Critical	0
🟠 High	17
🟡 Medium	58

View findings

[
  {
    "reason": "No test directory or test files found",
    "type": "no_tests",
    "file": "/home/runner/work/poly-k8s-mcp/poly-k8s-mcp",
    "action": "flag",
    "rule_module": "honest_completion",
    "severity": "high",
    "deduction": 20
  },
  {
    "reason": "Action perpolymath/standards/.github/workflows/governance-reusable.yml@main\n needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in codeql.yml",
    "type": "unknown",
    "file": "codeql.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "unknown",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "unknown",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "unknown",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "unknown",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "unknown",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in governance.yml",
    "type": "unknown",
    "file": "governance.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in hypatia-scan.yml",
    "type": "unknown",
    "file": "hypatia-scan.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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