#58987: Unify "Don't load directly" guards to use exit;

[masteradhoc]

Unifies all "Don't load directly" file guards across src/ to use a consistent
canonical form as recommended by the WordPress Plugin Developer Handbook
(https://developer.wordpress.org/plugins/plugin-basics/best-practices/#avoiding-direct-file-access):

// Don't load directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

Previously, files used three different patterns inconsistently:

• die( '-1' ); (36 files) — the -1 has no meaningful effect in a direct file-access context where no JavaScript AJAX handler is present to interpret it
• die(); (3 files, some also missing the comment or using "Do not load directly.")
• exit() (1 file, missing the comment)

This patch normalises all 40 affected files to exit; (bare, without parentheses,
matching the documented best practice) and ensures the // Don't load directly.
comment is present and consistently worded in every case.

Not changed:

• pluggable.php:1449 — die( '-1' ) inside a function body as an intentional AJAX response value
• wp-includes/assets/icon-library-manifest.php — auto-generated from a Gutenberg package source; must be fixed upstream
• Files where ABSPATH is defined (not guarded against), e.g. wp-load.php, load-scripts.php
• All other die() / exit() calls that are genuine program logic, not file guards

Trac ticket: https://core.trac.wordpress.org/ticket/58987

Use of AI Tools

AI assistance: Yes
Tool(s): GitHub Copilot
Model(s): Claude Sonnet 4.8
Used for: Identifying all affected files, generating the batch edits, and verifying no functional die()/exit() calls were touched. All changes were reviewed and approved by me.

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

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