chore(deno): drop root package.json stub (standards#253)

[hyperpolymath]

Summary

STEP 3 of campaign #253 (npm → Deno estate migration).

• The root package.json was a pure stub (name, version, "private": true, "type": "module", empty dependencies). Zero scripts, zero runtime deps — pure dead weight.
• Standards#253 flags package.json without deno.json for review; this root manifest signals no npm toolchain dependency and can simply go.
• tools/tree-sitter-twasm/package.json UNTOUCHED — that is a Class C carve-out (npm-publishable tree-sitter grammar with native bindings via tree-sitter-cli).

Test plan

• git ls-files | grep package.json returns only tools/tree-sitter-twasm/package.json (the carve-out).
• CI workflows unaffected (root stub had no scripts referenced anywhere).
• Hypatia :nodejs_detected doesn't flag — root no longer carries an npm signal.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 84 issues detected

Severity	Count
🔴 Critical	1
🟠 High	13
🟡 Medium	70

⚠️ 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 boj-build.yml",
    "type": "missing_timeout_minutes",
    "file": "boj-build.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in c5-regenerate.yml",
    "type": "missing_timeout_minutes",
    "file": "c5-regenerate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cargo-audit.yml",
    "type": "missing_timeout_minutes",
    "file": "cargo-audit.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 dogfood-gate.yml",
    "type": "missing_timeout_minutes",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "missing_timeout_minutes",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "missing_timeout_minutes",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "missing_timeout_minutes",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "missing_timeout_minutes",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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