fix(settings): keep wp_stream option autoload explicit

[faisalahammad]

Summary

The wp_stream settings option is loaded on every request (Plugin::init → Settings::__construct → get_options) for exclude rules, logging gates, and role access. Autoload must stay on; turning it off without lazy-loading would add a get_option query on every page load.

This change makes that intent explicit on write paths and repairs any install whose row was flipped to no-autoload.

Fixes #1482

Changes

classes/class-settings.php

Before:

$result = update_option( $this->option_key, $options );

register_setting(
    $this->option_key,
    $this->option_key,
    array( $this, 'sanitize_settings' )
);

After:

// Autoload on purpose: Settings loads this option on every request ...
$result = update_option( $this->option_key, $options, true );

register_setting(
    $this->option_key,
    $this->option_key,
    array(
        'type'              => 'array',
        'sanitize_callback' => array( $this, 'sanitize_settings' ),
        'autoload'          => true,
    )
);

// ensure_option_autoload() on admin_init repairs stray no-autoload rows
// via wp_set_option_autoload() when available (WP 6.4+).

Why: New writes and Settings API saves keep autoload on. A one-shot admin repair covers existing installs that somehow ended up with autoload off. Network settings (wp_stream_network / sitemeta) are untouched.

tests/phpunit/test-class-settings.php

Why: Cover the write path, no→yes repair, idempotency, and network-key no-op.

Testing

Test 1: Fresh save keeps autoload on

1. Stream → Settings, change a value, Save.
2. wp db query "SELECT option_name, autoload FROM wp_options WHERE option_name = 'wp_stream'"
   Result: autoload is yes / on / auto-on.

Test 2: Repair path

1. wp db query "UPDATE wp_options SET autoload = 'no' WHERE option_name = 'wp_stream'"
2. Load any WP Admin page once.
3. Re-check the query above.
   Result: autoload is back in the yes-family.

Test 3: Settings still work

1. Add an exclude rule and trigger matching / non-matching events.
   Result: matching event not logged; non-matching event logged. No PHP notices.

Automated: composer lint, composer lint-tests, PHPUnit Test_Settings (single-site + multisite) pass.