fix(dispatcher): log errors from buffered handlers

[fank]

Summary

Errors from buffered handlers were silently discarded in the goroutine processing loop.

Problem

In withBuffer, the handler was called but its error was ignored:

for e := range buffer {
    h(e)  // Error discarded!
    d.processed.Add(...)
}

This made debugging impossible - even with PR #53 (propagate errors), the errors were never logged.

Fix

Now errors are logged:

_, err := h(e)
if err != nil {
    d.logger.Error("buffered handler failed", "command", command, "error", err)
}

Test plan

• All dispatcher tests pass

[github-actions]

Merging this branch will decrease overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/OCAP2/extension/v5/internal/dispatcher	17.52% (-0.24%)	👎

---

Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/OCAP2/extension/v5/internal/dispatcher/dispatcher.go	17.42% (-0.24%)	924 (+24)	161 (+2)	763 (+22)	👎

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.