feat: log shutdown signal cause

[raeperd]

Summary

• Log which OS signal (SIGINT/SIGTERM) caused the server shutdown by adding context.Cause(ctx) to the shutdown log line
• Uses Go 1.26's signal.NotifyContext cancel cause, which automatically sets the context cause to the received signal

Test plan

• make test passes (all existing tests green)
• make lint passes (0 issues)
• Manual: run server, send SIGINT (Ctrl-C), verify log includes "cause":"signal: interrupt"
• Manual: run server, send SIGTERM, verify log includes "cause":"signal: terminated"

Summary by CodeRabbit

• Chores
  • Enhanced server shutdown logging to include additional contextual details during server termination.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8a0f5c49-3045-44b5-8808-0a34df52d0a2

📥 Commits

Reviewing files that changed from the base of the PR and between d7a3afa and 7449573.

📒 Files selected for processing (1)

• main.go

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📝 Walkthrough

Walkthrough

A single-line modification to main.go enhances the server shutdown logging by adding a structured field that captures the context cancellation reason using context.Cause(ctx), providing additional diagnostic information without altering shutdown behavior.

Changes

Cohort / File(s)	Summary
Shutdown Logging Enhancement main.go	Added slog.Any("cause", context.Cause(ctx)) field to capture the shutdown reason in the server shutdown log message.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A carrot of cause, now logged with care,
When servers must shutdown mid-air,
We'll know the "why" with structured delight,
Context revealed in logs so bright! 🌟

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: log shutdown signal cause' accurately describes the main change: adding structured logging of the shutdown signal cause via context.Cause(ctx).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/log-shutdown-cause

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[coveralls]

coverage: 79.739%. remained the same — feat/log-shutdown-cause into main