feat: include inspector UI in release binaries

[NathanFlurry]

Summary

• Add Node.js build stage to all release Dockerfiles to build the inspector frontend
• Copy pre-built inspector assets into Rust build stages so they get embedded in binaries
• Remove SANDBOX_AGENT_SKIP_INSPECTOR=1 from all Dockerfiles and the release workflow

Test plan

• Build linux-x86_64 locally: docker/release/build.sh x86_64-unknown-linux-musl
• Run the binary and verify inspector is embedded (should show "inspector ui available")
• Access the inspector UI at http://localhost:2468/ui/

🤖 Generated with Claude Code

[railway-app]

🚅 Deployed to the sandbox-agent-pr-34 environment in sandbox-agent

Service	Status	Web	Updated (UTC)
website	✅ Success (View Logs)	Web	Jan 30, 2026 at 8:07 am
inspector	✅ Success (View Logs)	Web	Jan 30, 2026 at 8:07 am

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[NathanFlurry]

• feat: include inspector UI in release binaries #34 👈 (View in Graphite)
• fix: download binaries from R2 before npm publish #40
• docs: simplify quickstart examples with --no-token default #39
• feat: show help with docs link when no command provided #38
• docs: link to CORS docs in inspector connect screen #37
• feat: add default root route with server info #36
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[NathanFlurry]

Merge activity

• Jan 30, 7:57 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jan 30, 8:06 AM UTC: Graphite rebased this pull request as part of a merge.
• Jan 30, 8:07 AM UTC: @NathanFlurry merged this pull request with Graphite.