Dead code: Option storage in Syndication_Logger is unreachable

## Summary

The `Syndication_Logger` class has an option storage code path (lines 347-377) that is unreachable through the public API.

## Background

PR #53 (2015) introduced the logging framework with two storage types:
- `object` - stores logs in post meta (implemented and used)
- `option` - stores logs in WP options (implemented but unreachable)

The error message at line 300 references a `log_option` method:
> "You need to provide a valid post_id or use log_option instead"

However, `log_option()` was never implemented. All public methods hardcode `storage_type = 'object'`:
- `log_post_error()` → `log_post()` → `log('object', ...)`
- `log_post_success()` → `log_post()` → `log('object', ...)`
- `log_post_info()` → `log_post()` → `log('object', ...)`

## Recommendation

Either:
1. **Remove the dead code** - Delete the option storage branch (lines 347-377) and update the error message
2. **Implement the feature** - Add `log_option_error()`, `log_option_success()`, `log_option_info()` methods if there's a use case

Option 1 is recommended unless there's a known need for option-based logging.

## Related

- PR #53 introduced this code
- Issues #20 and #45 were the original drivers for the logging framework

Start in the Syndication_Logger class at the error message around line 300 and the option-storage branch around lines 347-377, then trace log_post() and the log_post_error(), log_post_success(), and log_post_info() entry points. Confirm that no public API reaches option storage, then remove the unreachable branch and update the message, or document the use case before choosing the alternative implementation.

Written by the indexing model from the issue text.