test(daemon): enable goleak-based goroutine leak detection harness

[kangeunchan]

Enhancement Description

Enable goleak-based goroutine leak detection in daemon test harnesses to prevent cleanup regressions.

Summary

This PR adds goleak.VerifyTestMain to key daemon packages and applies a minimal allowlist for known safe exceptions.

Previously, goroutine leaks could pass silently in concurrency-heavy packages:

• lifecycle cleanup regressions were harder to catch
• leak detection was not consistently enforced in daemon tests

Now leak checks run automatically in targeted test packages.

What Changed

1) Added goleak TestMain harnesses

Added:

• internal/daemon/controller/main_test.go
• internal/daemon/server/main_test.go
• internal/daemon/runtime/main_test.go

2) Added scoped allowlist for known server test path

• allowlisted known safe/expected goroutine path in server test harness
• kept allowlist narrow to avoid masking new leaks

3) Added dependency and required test formatting updates

Updated:

• go.mod / go.sum
• internal/daemon/runtime/service_launchd_test.go

4) Tests

Leak-aware test runs were added for targeted daemon packages.

Why This Is Needed

This is a test reliability improvement for concurrency-heavy code.
Automatic leak detection catches lifecycle regressions before merge.

Behavior Notes / Regression Impact

No runtime feature behavior change.
Only test harness strictness is increased.

Validation Performed

• go test ./internal/daemon/controller -count=1
• go test ./internal/daemon/server -count=1
• go test ./internal/daemon/runtime -count=1
• go test ./...
• golangci-lint run