(CODUX-216) Implement governed HTTP capability for custom nodes

[numnx]

🧩 Task: Implement governed HTTP capability for custom nodes

Automated task PR opened by Code UX for T19.

📋 Summary

Sprint: Sprint 216 · Nodes Full Integration · Task: T19

Turn the existing project-scoped node-flow foundation and browser-local canvas into a canonical, secure, versioned automation control plane with registry-driven nodes, encrypted credentials, durable execution, governed integrations, isolated custom nodes, agent authoring, dashboard integration, and authenticated headless readiness.

🤖 Model & Provider

Provider	Codex CLI
Model	gpt-5.6-sol

⏱️ Timing

Started	2026-07-12 09:27:46 UTC
Finished	2026-07-12 09:42:45 UTC
Duration	14m 59s

📊 Token Usage

Metric	Value
Input tokens	183,770
Cached input tokens	5,499,648
Output tokens	30,495
Total tokens	5,713,913
Invocations	1
Tool calls	64
Active time	14m 31s

Included usage estimate (subscription/local login): $4.58

✅ QA Review

⏳ QA review runs after this PR is opened. Check the task card in the dashboard for the outcome once it lands.

📝 Full Task Prompt

### Objective
Make declared custom-node HTTP capability functional through the shared egress policy boundary.

### Requirements
Replace the generated runner's unconditional context.http failure with a controlled request bridge that consumes T04 egress policy, validates HTTPS/HTTP opt-in, DNS and private-network protections, redirects, headers, response size/content type, timeout, retries, and rate limits. Keep Docker network isolation and ensure credentials remain broker-resolved and redacted.

### Verification
Add mocked custom-node tests proving allowed requests succeed and SSRF, redirects, restricted headers, oversized responses, timeouts, retries, and undeclared network access fail closed. Run custom-node security tests, backend tests, audit, typecheck, build, and the credentialed drill.

🌿 Branch Info

Base: feature/CODUX-216-nodes-full-integration
Head: task/feature-codux-21-t19-codex-6f247abd-mrhlbj0x

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🤖 Generated by Code UX