feat(ports): wire portsAttributes into forwarding decisions

[skevetter]

Summary

Wires all 5 devcontainer portsAttributes fields into runtime behavior per the devcontainer spec:

• onAutoForward: ignore skips forwarding entirely; silent/empty logs at debug level; notify/openBrowser logs at info level
• label: surfaced in forwarder log output for port identification
• protocol: included in forwarder log metadata (http/https)
• requireLocalPort: enforced on the host-side forwarder — if the specified local port is unavailable, forwarding is skipped rather than falling back to a random port
• elevateIfNeeded: logs a warning when forwarding privileged ports (<1024) on Linux, advising the user to run with elevated permissions

The requireLocalPort check was intentionally removed from the container-side watcher (pkg/netstat/watcher.go) because it cannot meaningfully test host port availability from inside the container. Enforcement happens exclusively in the host-side forwarder (pkg/tunnel/forwarder.go).

Files changed:

• cmd/agent/container/credentials_server.go — propagate all 5 fields through the container-side port resolver
• pkg/netstat/watcher.go — pass attributes to forwarding decisions, remove broken container-side requireLocalPort check
• pkg/netstat/watcher_test.go — add tests for attribute propagation
• pkg/tunnel/forwarder.go — enforce requireLocalPort, elevateIfNeeded, onAutoForward, label, and protocol at the forwarding layer

[netlify]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7fb830f2-e39f-448a-ab0b-78d9a10e6e42

📥 Commits

Reviewing files that changed from the base of the PR and between 7cd689f and a85d279.

📒 Files selected for processing (9)

• cmd/agent/container/credentials_server.go
• cmd/runusercommands.go
• cmd/up/up.go
• cmd/up/up_client.go
• e2e/tests/ssh/ports_attributes_test.go
• e2e/tests/ssh/testdata/ports-attributes/.devcontainer.json
• pkg/netstat/watcher.go
• pkg/netstat/watcher_test.go
• pkg/tunnel/forwarder.go

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