[log] Add debug logging to HTTP server lifecycle in serve.go

[github-actions]

Adds 5 meaningful debugLog calls to serveAndWait in internal/cmd/serve.go, covering key HTTP server lifecycle events:

Log call	Event
Starting HTTP server: addr=%s, shutdownTimeout=%s	Function entry — server address and timeout
HTTP server exited unexpectedly, triggering shutdown: %v	Unexpected exit from serveFn before context is cancelled
Shutdown signal received, beginning graceful HTTP server shutdown	Context cancellation — graceful shutdown begins
Graceful shutdown failed, forcing close: %v	httpServer.Shutdown() returned an error
HTTP server shut down gracefully	Clean graceful shutdown path

Why this file?

serveAndWait is the core server lifecycle helper called from root.go for every gateway startup. It orchestrates background serving, signal handling, graceful shutdown, and error propagation — but had zero debug visibility. These logs help diagnose startup failures and shutdown timing issues.

Implementation notes

• Reuses the existing package-level debugLog = logger.New("cmd:root") declared in root.go — no new logger or import needed
• No side effects in log arguments (only uses already-computed values httpServer.Addr, timeout, err)
• All tests pass (make test-all green; Rust guard failure is a pre-existing network sandbox limitation)

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• index.crates.io

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "index.crates.io"

See Network Configuration for more information.

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