feat(stdlib): httpPostJson async-extern for out-of-process JSON POST

[hyperpolymath]

Adds pub extern fn httpPostJson(url, body_json) -> Thenable / Async to stdlib/Vscode.affine + canonical runtime impl in packages/affine-vscode/mod.js, following the exact #205 thenable convention (register the response Thenable; guest observes via thenableThen/thenableResultJson, identical to languageClientSendRequest).

Why: lets a VS Code extension reach a BoJ-server cartridge endpoint (e.g. reposystem_run_audit on boj-server :7700) as a real in-process request instead of shelling a CLI. Unblocks the BoJ-primary tier of the rsr-certifier extension rewire (PR-5d-B).

Failed/non-JSON responses settle as { __error } (same shape thenableThen uses for rejections) so guests can branch to a fallback.

Full dune test --force gate green: 257/257, zero regression.

Refs #103 #199 #205

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 44 issues detected

Severity	Count
🔴 Critical	12
🟠 High	21
🟡 Medium	11

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Stray AI.a2ml in root -- use 0-AI-MANIFEST.a2ml only",
    "type": "banned",
    "file": "AI.a2ml",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "reason": "Superseded by 0-AI-MANIFEST.a2ml",
    "type": "banned",
    "file": "AI.djot",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "reason": "Issue in quality.yml",
    "type": "missing_workflow",
    "file": "quality.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in security-policy.yml",
    "type": "missing_workflow",
    "file": "security-policy.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/example/smoke_driver.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/cli.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/mod.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/lib/compile.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/lib/runner.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  }
]

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