feat(netstat): wire portsAttributes into port forwarding watcher

[skevetter]

Summary

Enhances the netstat Watcher to consult devcontainer portsAttributes when deciding forwarding behavior. The Forwarder interface now accepts a PortForwardAttribute struct (label, protocol, onAutoForward) so forwarders can log metadata and enforce per-port policy.

• Added PortForwardAttribute struct and WithPortAttributes option to pkg/netstat/watcher.go
• Updated Forwarder interface: Forward(port string, attr PortForwardAttribute) error
• Container-side forwarder (credentials_server.go) now uses WithPortAttributes resolver instead of binary PortFilter
• Host-side SSH forwarder (pkg/tunnel/forwarder.go) updated to satisfy new interface
• E2E test expanded with otherPortsAttributes notify-policy coverage
• Unit tests cover new resolver option and attribute resolution

[netlify]

✅ Deploy Preview for devsydev canceled.

Name	Link
🔨 Latest commit	1721819
🔍 Latest deploy log	https://app.netlify.com/projects/devsydev/deploys/69f869cd809cb80008b2e3b7

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 8ae64709-5dae-4ab0-9af2-2d994ba50d65

📥 Commits

Reviewing files that changed from the base of the PR and between 7af1be2 and 1721819.

📒 Files selected for processing (6)

• cmd/agent/container/credentials_server.go
• e2e/tests/ssh/ports_attributes_test.go
• pkg/agent/tunnelserver/tunnelserver.go
• pkg/netstat/watcher.go
• pkg/netstat/watcher_test.go
• pkg/tunnel/forwarder.go

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