feat(deno): migrate frontier-practices npm → Deno (standards#253)

[hyperpolymath]

Summary

Class B npm→Deno migration of frontier-practices/ per standards#253 STEP 3.

• Deletes frontier-practices/package.json (2 devDeps: rescript, live-server).
• Updates frontier-practices/deno.json:
  • imports map adds live-server + rescript as npm: specifiers pinned to the previous semver.
  • tasks migrate: build → deno run -A --node-modules-dir=auto npm:rescript build, dev → deno run -A npm:live-server --port=3000 --open=tools/reveal-demo.html.
• Extends root .gitignore with the standards#67 npm-avoidant glob set (**/package-lock.json, yarn.lock, pnpm-lock.yaml, .npmrc).

vscode-extension/package.json is intentionally NOT touched — VSCode extension carve-out (hypatia /vscode/ prefix).

Recipe: standards/docs/migrations/npm-to-deno-template/MIGRATION.md.

Test plan

• cd frontier-practices && deno task build resolves rescript via npm and builds.
• cd frontier-practices && deno task dev serves tools/reveal-demo.html on port 3000.
• No regressions in vscode-extension/ (untouched).

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 96 issues detected

Severity	Count
🔴 Critical	6
🟠 High	39
🟡 Medium	51

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "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 cflite_batch.yml",
    "type": "missing_timeout_minutes",
    "file": "cflite_batch.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cflite_batch.yml",
    "type": "missing_timeout_minutes",
    "file": "cflite_batch.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cflite_pr.yml",
    "type": "missing_timeout_minutes",
    "file": "cflite_pr.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cflite_pr.yml",
    "type": "missing_timeout_minutes",
    "file": "cflite_pr.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in checker-scaling.yml",
    "type": "missing_timeout_minutes",
    "file": "checker-scaling.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in codeql.yml",
    "type": "missing_timeout_minutes",
    "file": "codeql.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in governance.yml",
    "type": "missing_timeout_minutes",
    "file": "governance.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in hypatia-scan.yml",
    "type": "missing_timeout_minutes",
    "file": "hypatia-scan.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "missing_timeout_minutes",
    "file": "mirror.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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